<link:linkbase
    xmlns:link="http://www.xbrl.org/2003/linkbase"
    xmlns:xlink="http://www.w3.org/1999/xlink"
    xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
    >

   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_157" roleURI="http://www.sol.it/xbrl/role/all/esef_role-000000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_159" roleURI="http://www.sol.it/xbrl/role/all/ias_1_role-210000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_9" roleURI="http://www.sol.it/xbrl/role/all/ias_1_role-320000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_161" roleURI="http://www.sol.it/xbrl/role/all/ias_1_role-410000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_162" roleURI="http://www.sol.it/xbrl/role/all/ias_1_role-420000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_10" roleURI="http://www.sol.it/xbrl/role/all/ias_1_role-610000"/>
   <link:roleRef xlink:type="simple" xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#id_181" roleURI="http://www.sol.it/xbrl/role/all/ias_7_role-520000"/>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/esef_role-000000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/esef_role-000000" xlink:type="extended">
      <link:loc xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_cor_NotesAccountingPoliciesAndMandatoryTags" xlink:label="esef_cor_NotesAccountingPoliciesAndMandatoryTags" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:label="ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:label="ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DomicileOfEntity" xlink:label="ifrs-full_DomicileOfEntity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_DomicileOfEntity"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LegalFormOfEntity" xlink:label="ifrs-full_LegalFormOfEntity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_LegalFormOfEntity"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CountryOfIncorporation" xlink:label="ifrs-full_CountryOfIncorporation" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_CountryOfIncorporation"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:label="ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_AddressOfRegisteredOfficeOfEntity"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PrincipalPlaceOfBusiness" xlink:label="ifrs-full_PrincipalPlaceOfBusiness" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_PrincipalPlaceOfBusiness"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:label="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfParentEntity" xlink:label="ifrs-full_NameOfParentEntity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_NameOfParentEntity"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfUltimateParentOfGroup" xlink:label="ifrs-full_NameOfUltimateParentOfGroup" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
                          xlink:to="ifrs-full_NameOfUltimateParentOfGroup"
                            order="100.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_1_role-210000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AssetsAbstract" xlink:label="ifrs-full_AssetsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssetsAbstract" xlink:label="ifrs-full_NoncurrentAssetsAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AssetsAbstract"
                          xlink:to="ifrs-full_NoncurrentAssetsAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssetsAbstract" xlink:label="ifrs-full_CurrentAssetsAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AssetsAbstract"
                          xlink:to="ifrs-full_CurrentAssetsAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets" xlink:label="ifrs-full_Assets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AssetsAbstract"
                          xlink:to="ifrs-full_Assets"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssetsAbstract" xlink:label="ifrs-full_NoncurrentAssetsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="ifrs-full_PropertyPlantAndEquipment" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_PropertyPlantAndEquipment"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Goodwill" xlink:label="ifrs-full_Goodwill" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_Goodwill"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:label="ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_IntangibleAssetsOtherThanGoodwill"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_Partecipazioni" xlink:label="ext_Partecipazioni" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ext_Partecipazioni"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentFinancialAssets" xlink:label="ifrs-full_OtherNoncurrentFinancialAssets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_OtherNoncurrentFinancialAssets"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxAssets" xlink:label="ifrs-full_DeferredTaxAssets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_DeferredTaxAssets"
                            order="120.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets" xlink:label="ifrs-full_NoncurrentAssets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentAssetsAbstract"
                          xlink:to="ifrs-full_NoncurrentAssets"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="160.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssetsAbstract" xlink:label="ifrs-full_CurrentAssetsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Inventories" xlink:label="ifrs-full_Inventories" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_Inventories"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTradeReceivables" xlink:label="ifrs-full_CurrentTradeReceivables" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_CurrentTradeReceivables"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentNonfinancialAssets" xlink:label="ifrs-full_OtherCurrentNonfinancialAssets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_OtherCurrentNonfinancialAssets"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentFinancialAssets" xlink:label="ifrs-full_OtherCurrentFinancialAssets" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_OtherCurrentFinancialAssets"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_CashAndCashEquivalents"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:label="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentAssetsAbstract"
                          xlink:to="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="100.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilitiesAbstract" xlink:label="ifrs-full_CurrentLiabilitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_DebitiVersoBanche" xlink:label="ext_DebitiVersoBanche" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ext_DebitiVersoBanche"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:label="ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentFinancialLiabilities" xlink:label="ifrs-full_OtherCurrentFinancialLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_OtherCurrentFinancialLiabilities"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:label="ifrs-full_CurrentTaxLiabilitiesCurrent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_CurrentTaxLiabilitiesCurrent"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherCurrentNonfinancialLiabilities" xlink:label="ifrs-full_OtherCurrentNonfinancialLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_OtherCurrentNonfinancialLiabilities"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale" xlink:label="ifrs-full_CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="80.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAbstract" xlink:label="ifrs-full_EquityAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapital" xlink:label="ifrs-full_IssuedCapital" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_IssuedCapital"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremium" xlink:label="ifrs-full_SharePremium" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_SharePremium"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatutoryReserve" xlink:label="ifrs-full_StatutoryReserve" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_StatutoryReserve"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TreasuryShares" xlink:label="ifrs-full_TreasuryShares" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_TreasuryShares"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReserves" xlink:label="ifrs-full_OtherReserves" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_OtherReserves"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarnings" xlink:label="ifrs-full_RetainedEarnings" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_RetainedEarnings"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RisultatoAttribuibileAllaControllante" xlink:label="ext_RisultatoAttribuibileAllaControllante" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ext_RisultatoAttribuibileAllaControllante"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_EquityAttributableToOwnersOfParent"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_PatrimonioNettoDiTerziSenzaUtileDiEsercizio" xlink:label="ext_PatrimonioNettoDiTerziSenzaUtileDiEsercizio" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ext_PatrimonioNettoDiTerziSenzaUtileDiEsercizio"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RisultatoAttribuibileAiTerzi" xlink:label="ext_RisultatoAttribuibileAiTerzi" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ext_RisultatoAttribuibileAiTerzi"
                            order="110.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterests" xlink:label="ifrs-full_NoncontrollingInterests" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_NoncontrollingInterests"
                            order="120.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAbstract"
                          xlink:to="ifrs-full_Equity"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="130.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilitiesAbstract" xlink:label="ifrs-full_EquityAndLiabilitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAbstract" xlink:label="ifrs-full_EquityAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAndLiabilitiesAbstract"
                          xlink:to="ifrs-full_EquityAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LiabilitiesAbstract" xlink:label="ifrs-full_LiabilitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAndLiabilitiesAbstract"
                          xlink:to="ifrs-full_LiabilitiesAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities" xlink:label="ifrs-full_EquityAndLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAndLiabilitiesAbstract"
                          xlink:to="ifrs-full_EquityAndLiabilities"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LiabilitiesAbstract" xlink:label="ifrs-full_LiabilitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilitiesAbstract" xlink:label="ifrs-full_NoncurrentLiabilitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_LiabilitiesAbstract"
                          xlink:to="ifrs-full_NoncurrentLiabilitiesAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilitiesAbstract" xlink:label="ifrs-full_CurrentLiabilitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_LiabilitiesAbstract"
                          xlink:to="ifrs-full_CurrentLiabilitiesAbstract"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilitiesAbstract" xlink:label="ifrs-full_NoncurrentLiabilitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentProvisionsAbstract" xlink:label="ifrs-full_NoncurrentProvisionsAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_NoncurrentProvisionsAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="ifrs-full_DeferredTaxLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_DeferredTaxLiabilities"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:label="ifrs-full_OtherNoncurrentFinancialLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_OtherNoncurrentFinancialLiabilities"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="ifrs-full_NoncurrentLiabilities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentLiabilitiesAbstract"
                          xlink:to="ifrs-full_NoncurrentLiabilities"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="70.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentProvisionsAbstract" xlink:label="ifrs-full_NoncurrentProvisionsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentProvisionsForEmployeeBenefits" xlink:label="ifrs-full_NoncurrentProvisionsForEmployeeBenefits" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentProvisionsAbstract"
                          xlink:to="ifrs-full_NoncurrentProvisionsForEmployeeBenefits"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherLongtermProvisions" xlink:label="ifrs-full_OtherLongtermProvisions" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_NoncurrentProvisionsAbstract"
                          xlink:to="ifrs-full_OtherLongtermProvisions"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-210000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfFinancialPositionAbstract" xlink:label="ifrs-full_StatementOfFinancialPositionAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AssetsAbstract" xlink:label="ifrs-full_AssetsAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfFinancialPositionAbstract"
                          xlink:to="ifrs-full_AssetsAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilitiesAbstract" xlink:label="ifrs-full_EquityAndLiabilitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfFinancialPositionAbstract"
                          xlink:to="ifrs-full_EquityAndLiabilitiesAbstract"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_1_role-320000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsPerShareAbstract" xlink:label="ifrs-full_BasicEarningsPerShareAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="ifrs-full_BasicEarningsLossPerShare" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_BasicEarningsPerShareAbstract"
                          xlink:to="ifrs-full_BasicEarningsLossPerShare"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ClassesOfOrdinarySharesAxis" xlink:label="ifrs-full_ClassesOfOrdinarySharesAxis" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OrdinarySharesMember" xlink:label="ifrs-full_OrdinarySharesMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ClassesOfOrdinarySharesAxis"
                          xlink:to="ifrs-full_OrdinarySharesMember"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareAbstract" xlink:label="ifrs-full_EarningsPerShareAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareTable" xlink:label="ifrs-full_EarningsPerShareTable" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EarningsPerShareAbstract"
                          xlink:to="ifrs-full_EarningsPerShareTable"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareLineItems" xlink:label="ifrs-full_EarningsPerShareLineItems" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EarningsPerShareAbstract"
                          xlink:to="ifrs-full_EarningsPerShareLineItems"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareTable" xlink:label="ifrs-full_EarningsPerShareTable" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ClassesOfOrdinarySharesAxis" xlink:label="ifrs-full_ClassesOfOrdinarySharesAxis" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EarningsPerShareTable"
                          xlink:to="ifrs-full_ClassesOfOrdinarySharesAxis"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareLineItems" xlink:label="ifrs-full_EarningsPerShareLineItems" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsPerShareAbstract" xlink:label="ifrs-full_BasicEarningsPerShareAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EarningsPerShareLineItems"
                          xlink:to="ifrs-full_BasicEarningsPerShareAbstract"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeStatementAbstract" xlink:label="ifrs-full_IncomeStatementAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAbstract" xlink:label="ifrs-full_ProfitLossAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_IncomeStatementAbstract"
                          xlink:to="ifrs-full_ProfitLossAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToAbstract" xlink:label="ifrs-full_ProfitLossAttributableToAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_IncomeStatementAbstract"
                          xlink:to="ifrs-full_ProfitLossAttributableToAbstract"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EarningsPerShareAbstract" xlink:label="ifrs-full_EarningsPerShareAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_IncomeStatementAbstract"
                          xlink:to="ifrs-full_EarningsPerShareAbstract"
                            order="31.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAbstract" xlink:label="ifrs-full_ProfitLossAbstract" xlink:type="locator"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_VenditeNette" xlink:label="ext_VenditeNette" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ext_VenditeNette"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncome" xlink:label="ifrs-full_OtherIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_OtherIncome"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherWorkPerformedByEntityAndCapitalised" xlink:label="ifrs-full_OtherWorkPerformedByEntityAndCapitalised" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_OtherWorkPerformedByEntityAndCapitalised"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Revenue" xlink:label="ifrs-full_Revenue" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_Revenue"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RawMaterialsAndConsumablesUsed" xlink:label="ifrs-full_RawMaterialsAndConsumablesUsed" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_RawMaterialsAndConsumablesUsed"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ServicesExpense" xlink:label="ifrs-full_ServicesExpense" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ServicesExpense"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress" xlink:label="ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ChangesInInventoriesOfFinishedGoodsAndWorkInProgress"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherExpenseByNature" xlink:label="ifrs-full_OtherExpenseByNature" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_OtherExpenseByNature"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_TotaleCosti" xlink:label="ext_TotaleCosti" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ext_TotaleCosti"
                            order="110.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_ValoreAggiunto" xlink:label="ext_ValoreAggiunto" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ext_ValoreAggiunto"
                            order="120.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EmployeeBenefitsExpense" xlink:label="ifrs-full_EmployeeBenefitsExpense" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_EmployeeBenefitsExpense"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="130.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_MargineOperativoLordo" xlink:label="ext_MargineOperativoLordo" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ext_MargineOperativoLordo"
                            order="140.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DepreciationAndAmortisationExpense" xlink:label="ifrs-full_DepreciationAndAmortisationExpense" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_DepreciationAndAmortisationExpense"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="150.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="160.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="ifrs-full_ProfitLossFromOperatingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ProfitLossFromOperatingActivities"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="180.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncome" xlink:label="ifrs-full_FinanceIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_FinanceIncome"
                            order="240.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCosts" xlink:label="ifrs-full_FinanceCosts" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_FinanceCosts"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="250.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"
                            order="260.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_TotaleProventi_oneriFinanziari" xlink:label="ext_TotaleProventi_oneriFinanziari" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ext_TotaleProventi_oneriFinanziari"
                            order="280.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="ifrs-full_ProfitLossBeforeTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ProfitLossBeforeTax"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="350.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="360.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromContinuingOperations" xlink:label="ifrs-full_ProfitLossFromContinuingOperations" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ProfitLossFromContinuingOperations"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="370.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAbstract"
                          xlink:to="ifrs-full_ProfitLoss"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="390.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-320000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToAbstract" xlink:label="ifrs-full_ProfitLossAttributableToAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAttributableToAbstract"
                          xlink:to="ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ProfitLossAttributableToAbstract"
                          xlink:to="ifrs-full_ProfitLossAttributableToOwnersOfParent"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_1_role-410000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-410000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-410000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="60.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-410000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:label="ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeAbstract"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncome"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                            order="50.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_1_role-420000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowHedgesAbstract" xlink:label="ifrs-full_CashFlowHedgesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:label="ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowHedgesAbstract"
                          xlink:to="ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowHedgesAbstract" xlink:label="ifrs-full_CashFlowHedgesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract"
                          xlink:to="ifrs-full_CashFlowHedgesAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExchangeDifferencesOnTranslationAbstract" xlink:label="ifrs-full_ExchangeDifferencesOnTranslationAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract"
                          xlink:to="ifrs-full_ExchangeDifferencesOnTranslationAbstract"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ExchangeDifferencesOnTranslationAbstract" xlink:label="ifrs-full_ExchangeDifferencesOnTranslationAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:label="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ExchangeDifferencesOnTranslationAbstract"
                          xlink:to="ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationBeforeTax"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract"
                          xlink:to="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"
                            order="110.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:label="ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract"
                          xlink:to="ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossAbstract"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract" xlink:label="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossAbstract"
                            order="100.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-420000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:label="ifrs-full_StatementOfComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="ifrs-full_OtherComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeAbstract"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_TotaleAltriUtili_perditeAlNettoDiEffettoFiscale" xlink:label="ext_TotaleAltriUtili_perditeAlNettoDiEffettoFiscale" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ext_TotaleAltriUtili_perditeAlNettoDiEffettoFiscale"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncome"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToAbstract"
                            order="80.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_1_role-610000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ChangesInEquityAbstract" xlink:label="ifrs-full_ChangesInEquityAbstract" xlink:type="locator"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RipartizioneRisultatoEsercizioPrecedente" xlink:label="ext_RipartizioneRisultatoEsercizioPrecedente" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ChangesInEquityAbstract"
                          xlink:to="ext_RipartizioneRisultatoEsercizioPrecedente"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsPaid" xlink:label="ifrs-full_DividendsPaid" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ChangesInEquityAbstract"
                          xlink:to="ifrs-full_DividendsPaid"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:label="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ChangesInEquityAbstract"
                          xlink:to="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ChangesInEquityAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncomeAbstract"
                            order="40.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAbstract" xlink:label="ifrs-full_ComprehensiveIncomeAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComprehensiveIncomeAbstract"
                          xlink:to="ifrs-full_ComprehensiveIncome"
                            preferredLabel="http://www.xbrl.org/2003/role/totalLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityMember" xlink:label="ifrs-full_EquityMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_ComponentsOfEquityAxis"
                          xlink:to="ifrs-full_EquityMember"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityMember" xlink:label="ifrs-full_EquityMember" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityMember"
                          xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatutoryReserveMember" xlink:label="ifrs-full_StatutoryReserveMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityMember"
                          xlink:to="ifrs-full_StatutoryReserveMember"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_UtileNettoDellaCapogruppo" xlink:label="ext_UtileNettoDellaCapogruppo" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityMember"
                          xlink:to="ext_UtileNettoDellaCapogruppo"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="ifrs-full_NoncontrollingInterestsMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityMember"
                          xlink:to="ifrs-full_NoncontrollingInterestsMember"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_UtileNetto" xlink:label="ext_UtileNetto" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityMember"
                          xlink:to="ext_UtileNetto"
                            order="50.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapitalMember" xlink:label="ifrs-full_IssuedCapitalMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
                          xlink:to="ifrs-full_IssuedCapitalMember"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremiumMember" xlink:label="ifrs-full_SharePremiumMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
                          xlink:to="ifrs-full_SharePremiumMember"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReservesMember" xlink:label="ifrs-full_OtherReservesMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
                          xlink:to="ifrs-full_OtherReservesMember"
                            order="50.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RestatedMember" xlink:label="ifrs-full_RestatedMember" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PreviouslyStatedMember" xlink:label="ifrs-full_PreviouslyStatedMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_RestatedMember"
                          xlink:to="ifrs-full_PreviouslyStatedMember"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:label="ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RestatedMember" xlink:label="ifrs-full_RestatedMember" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis"
                          xlink:to="ifrs-full_RestatedMember"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityAbstract" xlink:label="ifrs-full_StatementOfChangesInEquityAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="ifrs-full_StatementOfChangesInEquityTable" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityAbstract"
                          xlink:to="ifrs-full_StatementOfChangesInEquityTable"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="ifrs-full_StatementOfChangesInEquityLineItems" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityAbstract"
                          xlink:to="ifrs-full_StatementOfChangesInEquityLineItems"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="ifrs-full_StatementOfChangesInEquityTable" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="ifrs-full_ComponentsOfEquityAxis" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityTable"
                          xlink:to="ifrs-full_ComponentsOfEquityAxis"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:label="ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityTable"
                          xlink:to="ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis"
                            order="20.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="ifrs-full_StatementOfChangesInEquityLineItems" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
                          xlink:to="ifrs-full_Equity"
                            preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ChangesInEquityAbstract" xlink:label="ifrs-full_ChangesInEquityAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
                          xlink:to="ifrs-full_ChangesInEquityAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="ifrs-full_Equity_2" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
                          xlink:to="ifrs-full_Equity_2"
                            preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"
                            order="30.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <!-- http://www.xbrl.org/2003/arcrole/parent-child http://www.sol.it/xbrl/role/all/ias_7_role-520000 -->
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:label="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:label="ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForFinanceCosts" xlink:label="ifrs-full_AdjustmentsForFinanceCosts" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForFinanceCosts"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RettifichePerTfrEBeneficiAiDipendentiMaturati" xlink:label="ext_RettifichePerTfrEBeneficiAiDipendentiMaturati" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ext_RettifichePerTfrEBeneficiAiDipendentiMaturati"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForProvisions" xlink:label="ifrs-full_AdjustmentsForProvisions" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForProvisions"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:label="ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForIncomeTaxExpense"
                            order="50.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForDecreaseIncreaseInInventories"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForDecreaseIncreaseInOtherOperatingReceivables"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAccountPayable"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_AdjustmentsForIncreaseDecreaseInOtherOperatingPayables"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RettifichePerDebitiTributari" xlink:label="ext_RettifichePerDebitiTributari" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ext_RettifichePerDebitiTributari"
                            order="110.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherAdjustmentsForNoncashItems" xlink:label="ifrs-full_OtherAdjustmentsForNoncashItems" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                          xlink:to="ifrs-full_OtherAdjustmentsForNoncashItems"
                            order="170.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2003/role/terseLabel"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:label="ifrs-full_RepaymentsOfBondsNotesAndDebentures" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_RepaymentsOfBondsNotesAndDebentures"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:label="ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_ProceedsFromIssueOfBondsNotesAndDebentures"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="110.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:label="ifrs-full_ProceedsFromNoncurrentBorrowings" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_ProceedsFromNoncurrentBorrowings"
                            order="120.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_DividendsPaidClassifiedAsFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="140.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:label="ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_InterestPaidClassifiedAsFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="150.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/netLabel"
                            order="180.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_RivalutazioniEAltriMovimentiDiImmobilizzazioniMateriali" xlink:label="ext_RivalutazioniEAltriMovimentiDiImmobilizzazioniMateriali" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ext_RivalutazioniEAltriMovimentiDiImmobilizzazioniMateriali"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:label="ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities"
                            preferredLabel="http://www.xbrl.org/2003/role/terseLabel"
                            order="220.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_Incremento_decrementoDiPartecipazioniERamiDiAzienda" xlink:label="ext_Incremento_decrementoDiPartecipazioniERamiDiAzienda" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ext_Incremento_decrementoDiPartecipazioniERamiDiAzienda"
                            order="240.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments" xlink:label="ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments"
                            order="250.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/netLabel"
                            order="260.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:label="ifrs-full_AdjustmentsForReconcileProfitLossAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_AdjustmentsForReconcileProfitLossAbstract"
                            order="10.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:label="ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_TotaleVariazioniNelPassivoEAttivoCorrente" xlink:label="ext_TotaleVariazioniNelPassivoEAttivoCorrente" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ext_TotaleVariazioniNelPassivoEAttivoCorrente"
                            order="100.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"
                            order="110.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_ProfitLossAttributableToOwnersOfParent"
                            order="120.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
                            order="130.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                            preferredLabel="http://www.xbrl.org/2009/role/netLabel"
                            order="140.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract" xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract"
                          xlink:to="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"
                            order="10.0"
                          xlink:type="arc"/>
   </link:presentationLink>
   <link:presentationLink xlink:role="http://www.sol.it/xbrl/role/all/ias_7_role-520000" xlink:type="extended">
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfCashFlowsAbstract" xlink:label="ifrs-full_StatementOfCashFlowsAbstract" xlink:type="locator"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract"
                            order="20.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract"
                            order="30.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract"
                            order="40.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract" xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalentsAbstract"
                            order="60.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:label="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"
                            preferredLabel="http://www.xbrl.org/2009/role/netLabel"
                            order="70.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_CashAndCashEquivalents"
                            preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"
                            order="80.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="81560096A9AEBBBD4B25-2021-12-31.xsd#ext_DisponibilitaLiquideEMezziEquivalentiEsclusoBanchePassiveCorrenti" xlink:label="ext_DisponibilitaLiquideEMezziEquivalentiEsclusoBanchePassiveCorrenti" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ext_DisponibilitaLiquideEMezziEquivalentiEsclusoBanchePassiveCorrenti"
                            order="90.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="ifrs-full_CashAndCashEquivalents_2" xlink:type="locator"/>
      <link:presentationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child"
                          xlink:from="ifrs-full_StatementOfCashFlowsAbstract"
                          xlink:to="ifrs-full_CashAndCashEquivalents_2"
                            preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"
                            order="100.0"
                          xlink:type="arc"/>
   </link:presentationLink>

</link:linkbase>