<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="8156009E94ED54DE7C31-2021-12-31.xsd#id_159" roleURI="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-210000"/>
   <link:roleRef xlink:type="simple" xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#id_9" roleURI="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-320000"/>
   <link:roleRef xlink:type="simple" xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#id_161" roleURI="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-410000"/>
   <link:roleRef xlink:type="simple" xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#id_10" roleURI="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-610000"/>
   <link:roleRef xlink:type="simple" xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#id_181" roleURI="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_7_role-520000"/>
   <!-- http://www.xbrl.org/2003/arcrole/summation-item https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-210000 -->
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_NoncurrentLiabilities" xlink:label="ifrs-full_NoncurrentLiabilities" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentLiabilities"
                          xlink:to="ifrs-full_NoncurrentProvisionsForEmployeeBenefits"
                            weight="1.0"
                            order="1"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentLiabilities"
                          xlink:to="ifrs-full_OtherLongtermProvisions"
                            weight="1.0"
                            order="2"
                          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_NoncurrentFinancialLiabilities" xlink:label="ifrs-full_NoncurrentFinancialLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentLiabilities"
                          xlink:to="ifrs-full_NoncurrentFinancialLiabilities"
                            weight="1.0"
                            order="3"
                          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_OtherNoncurrentLiabilities" xlink:label="ifrs-full_OtherNoncurrentLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentLiabilities"
                          xlink:to="ifrs-full_OtherNoncurrentLiabilities"
                            weight="1.0"
                            order="4"
                          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_LongtermBorrowings" xlink:label="ifrs-full_LongtermBorrowings" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentLiabilities"
                          xlink:to="ifrs-full_LongtermBorrowings"
                            weight="1.0"
                            order="5"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_Assets" xlink:label="ifrs-full_Assets" 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_NoncurrentAssets" xlink:label="ifrs-full_NoncurrentAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_Assets"
                          xlink:to="ifrs-full_NoncurrentAssets"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_Assets"
                          xlink:to="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                            weight="1.0"
                            order="11.0"
                          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_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:label="ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_Assets"
                          xlink:to="ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                            weight="1.0"
                            order="12.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_NoncurrentAssets" xlink:label="ifrs-full_NoncurrentAssets" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_PropertyPlantAndEquipment"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_Goodwill"
                            order="30.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_IntangibleAssetsOtherThanGoodwill"
                            order="40.0"
                            weight="1.0"
                          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_InvestmentAccountedForUsingEquityMethod" xlink:label="ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_InvestmentAccountedForUsingEquityMethod"
                            order="50.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_DeferredTaxAssets"
                            order="100.0"
                            weight="1.0"
                          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_NoncurrentFinancialAssets" xlink:label="ifrs-full_NoncurrentFinancialAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_NoncurrentFinancialAssets"
                            weight="1.0"
                            order="101.0"
                          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_OtherNoncurrentAssets" xlink:label="ifrs-full_OtherNoncurrentAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_NoncurrentAssets"
                          xlink:to="ifrs-full_OtherNoncurrentAssets"
                            weight="1.0"
                            order="102.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" xlink:label="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_Inventories"
                            order="10.0"
                            weight="1.0"
                          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_CurrentTaxAssetsCurrent" xlink:label="ifrs-full_CurrentTaxAssetsCurrent" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_CurrentTaxAssetsCurrent"
                            order="30.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_CashAndCashEquivalents"
                            weight="1.0"
                            order="31.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_CurrentTradeReceivables"
                            weight="1.0"
                            order="32.0"
                          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_CurrentFinancialAssets" xlink:label="ifrs-full_CurrentFinancialAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_CurrentFinancialAssets"
                            weight="1.0"
                            order="33.0"
                          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_OtherCurrentAssets" xlink:label="ifrs-full_OtherCurrentAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners"
                          xlink:to="ifrs-full_OtherCurrentAssets"
                            weight="1.0"
                            order="34.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_EquityAndLiabilities" xlink:label="ifrs-full_EquityAndLiabilities" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAndLiabilities"
                          xlink:to="ifrs-full_Equity"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAndLiabilities"
                          xlink:to="ifrs-full_NoncurrentLiabilities"
                            weight="1.0"
                            order="11.0"
                          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_CurrentLiabilities" xlink:label="ifrs-full_CurrentLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAndLiabilities"
                          xlink:to="ifrs-full_CurrentLiabilities"
                            weight="1.0"
                            order="12.0"
                          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_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale" xlink:label="ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAndLiabilities"
                          xlink:to="ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"
                            weight="1.0"
                            order="13.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_Equity" xlink:label="ifrs-full_Equity" 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_EquityAttributableToOwnersOfParent" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_Equity"
                          xlink:to="ifrs-full_EquityAttributableToOwnersOfParent"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_Equity"
                          xlink:to="ifrs-full_NoncontrollingInterests"
                            order="20.0"
                            weight="1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_EquityAttributableToOwnersOfParent" xlink:label="ifrs-full_EquityAttributableToOwnersOfParent" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
                          xlink:to="ifrs-full_IssuedCapital"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
                          xlink:to="ifrs-full_RetainedEarnings"
                            order="20.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
                          xlink:to="ifrs-full_OtherReserves"
                            order="60.0"
                            weight="1.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_ProfitLossAttributableToOwnersOfParent" xlink:label="ext_ProfitLossAttributableToOwnersOfParent" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
                          xlink:to="ext_ProfitLossAttributableToOwnersOfParent"
                            weight="1.0"
                            order="61.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_InterimDividend" xlink:label="ext_InterimDividend" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
                          xlink:to="ext_InterimDividend"
                            weight="1.0"
                            order="62.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_CurrentLiabilities" xlink:label="ifrs-full_CurrentLiabilities" 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_ShorttermBorrowings" xlink:label="ifrs-full_ShorttermBorrowings" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_ShorttermBorrowings"
                            weight="1.0"
                            order="1"
                          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_CurrentPortionOfLongtermBorrowings" xlink:label="ifrs-full_CurrentPortionOfLongtermBorrowings" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_CurrentPortionOfLongtermBorrowings"
                            weight="1.0"
                            order="2"
                          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_TradeAndOtherPayablesToTradeSuppliers" xlink:label="ifrs-full_TradeAndOtherPayablesToTradeSuppliers" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_TradeAndOtherPayablesToTradeSuppliers"
                            weight="1.0"
                            order="3"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_CurrentTaxLiabilitiesCurrent"
                            weight="1.0"
                            order="4"
                          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_CurrentFinancialLiabilities" xlink:label="ifrs-full_CurrentFinancialLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_CurrentFinancialLiabilities"
                            weight="1.0"
                            order="5"
                          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_OtherCurrentLiabilities" xlink:label="ifrs-full_OtherCurrentLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CurrentLiabilities"
                          xlink:to="ifrs-full_OtherCurrentLiabilities"
                            weight="1.0"
                            order="6"
                          xlink:type="arc"/>
   </link:calculationLink>
   <!-- http://www.xbrl.org/2003/arcrole/summation-item https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-320000 -->
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ProfitLoss" xlink:label="ifrs-full_ProfitLoss" 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_ProfitLossFromContinuingOperations" xlink:label="ifrs-full_ProfitLossFromContinuingOperations" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLoss"
                          xlink:to="ifrs-full_ProfitLossFromContinuingOperations"
                            order="10.0"
                            weight="1.0"
                          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_ProfitLossFromDiscontinuedOperations" xlink:label="ifrs-full_ProfitLossFromDiscontinuedOperations" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLoss"
                          xlink:to="ifrs-full_ProfitLossFromDiscontinuedOperations"
                            order="20.0"
                            weight="1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ProfitLossFromContinuingOperations" xlink:label="ifrs-full_ProfitLossFromContinuingOperations" 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_ProfitLossBeforeTax" xlink:label="ifrs-full_ProfitLossBeforeTax" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromContinuingOperations"
                          xlink:to="ifrs-full_ProfitLossBeforeTax"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromContinuingOperations"
                          xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations"
                            order="20.0"
                            weight="-1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ProfitLossBeforeTax" xlink:label="ifrs-full_ProfitLossBeforeTax" 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_ProfitLossFromOperatingActivities" xlink:label="ifrs-full_ProfitLossFromOperatingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossBeforeTax"
                          xlink:to="ifrs-full_ProfitLossFromOperatingActivities"
                            order="10.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossBeforeTax"
                          xlink:to="ifrs-full_FinanceIncome"
                            order="50.0"
                            weight="1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossBeforeTax"
                          xlink:to="ifrs-full_FinanceCosts"
                            order="60.0"
                            weight="-1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossBeforeTax"
                          xlink:to="ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"
                            order="100.0"
                            weight="1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ProfitLossFromOperatingActivities" xlink:label="ifrs-full_ProfitLossFromOperatingActivities" 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_RevenueAndOperatingIncome" xlink:label="ifrs-full_RevenueAndOperatingIncome" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_RevenueAndOperatingIncome"
                            weight="1.0"
                            order="49.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_RawMaterialsAndConsumablesUsed"
                            order="50.0"
                            weight="-1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_EmployeeBenefitsExpense"
                            order="60.0"
                            weight="-1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_OtherExpenseByNature"
                            order="90.0"
                            weight="-1.0"
                          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_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
                            weight="-1.0"
                            order="91.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ProfitLossFromOperatingActivities"
                          xlink:to="ifrs-full_ServicesExpense"
                            weight="-1.0"
                            order="92.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_EmployeeBenefitsExpense" xlink:label="ifrs-full_EmployeeBenefitsExpense" xlink:type="locator"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_EmployeeBenefitsExpenseGrossPersonnelExpenses" xlink:label="ext_EmployeeBenefitsExpenseGrossPersonnelExpenses" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EmployeeBenefitsExpense"
                          xlink:to="ext_EmployeeBenefitsExpenseGrossPersonnelExpenses"
                            weight="1.0"
                            order="1"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_EmployeeBenefitsExpenseCapitalisedPersonnelExpenses" xlink:label="ext_EmployeeBenefitsExpenseCapitalisedPersonnelExpenses" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_EmployeeBenefitsExpense"
                          xlink:to="ext_EmployeeBenefitsExpenseCapitalisedPersonnelExpenses"
                            weight="1.0"
                            order="2"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_RevenueAndOperatingIncome" xlink:label="ifrs-full_RevenueAndOperatingIncome" 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_OtherRevenue" xlink:label="ifrs-full_OtherRevenue" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_RevenueAndOperatingIncome"
                          xlink:to="ifrs-full_OtherRevenue"
                            weight="1.0"
                            order="1"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_RevenueAndOperatingIncome"
                          xlink:to="ifrs-full_Revenue"
                            weight="1.0"
                            order="2"
                          xlink:type="arc"/>
   </link:calculationLink>
   <!-- http://www.xbrl.org/2003/arcrole/summation-item https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-410000 -->
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ComprehensiveIncome"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="10.0"
                            weight="1.0"
                          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_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ComprehensiveIncome"
                          xlink:to="ifrs-full_OtherComprehensiveIncome"
                            order="20.0"
                            weight="1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" 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_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncome"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                            weight="1.0"
                            order="1"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" 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_GainsLossesOnCashFlowHedgesNetOfTax" xlink:label="ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                          xlink:to="ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax"
                            order="10.0"
                            weight="1.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeOCI" xlink:label="ext_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeOCI" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                          xlink:to="ext_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeOCI"
                            weight="1.0"
                            order="11.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_GainsOrLossesFromTranslationOfFinancialStatementsInCurrenciesOtherThanTheEuro" xlink:label="ext_GainsOrLossesFromTranslationOfFinancialStatementsInCurrenciesOtherThanTheEuro" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                          xlink:to="ext_GainsOrLossesFromTranslationOfFinancialStatementsInCurrenciesOtherThanTheEuro"
                            weight="1.0"
                            order="12.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_CostOfHedges" xlink:label="ext_CostOfHedges" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                          xlink:to="ext_CostOfHedges"
                            weight="1.0"
                            order="13.0"
                          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_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges"
                          xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"
                            weight="1.0"
                            order="14.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <!-- http://www.xbrl.org/2003/arcrole/summation-item https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-610000 -->
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_ComprehensiveIncome" xlink:label="ifrs-full_ComprehensiveIncome" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ComprehensiveIncome"
                          xlink:to="ifrs-full_ProfitLoss"
                            order="10.0"
                            weight="1.0"
                          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_OtherComprehensiveIncome" xlink:label="ifrs-full_OtherComprehensiveIncome" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_ComprehensiveIncome"
                          xlink:to="ifrs-full_OtherComprehensiveIncome"
                            order="20.0"
                            weight="1.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_TotalOtherChanges" xlink:label="ext_TotalOtherChanges" xlink:type="locator"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_ReserveForStockOption" xlink:label="ext_ReserveForStockOption" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalOtherChanges"
                          xlink:to="ext_ReserveForStockOption"
                            weight="1.0"
                            order="1"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_OtherChanges" xlink:label="ext_OtherChanges" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalOtherChanges"
                          xlink:to="ext_OtherChanges"
                            weight="1.0"
                            order="2"
                          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_IncreaseDecreaseThroughAcquisitionOfSubsidiary" xlink:label="ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalOtherChanges"
                          xlink:to="ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary"
                            weight="1.0"
                            order="3"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_1_role-610000" xlink:type="extended">
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_TotalTransactionsWithShareholders" xlink:label="ext_TotalTransactionsWithShareholders" 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_IncreaseDecreaseThroughAppropriationOfRetainedEarnings" xlink:label="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalTransactionsWithShareholders"
                          xlink:to="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
                            weight="1.0"
                            order="1"
                          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_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears" xlink:label="ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalTransactionsWithShareholders"
                          xlink:to="ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears"
                            weight="-1.0"
                            order="2"
                          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_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear" xlink:label="ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalTransactionsWithShareholders"
                          xlink:to="ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear"
                            weight="-1.0"
                            order="3"
                          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_PurchaseOfTreasuryShares" xlink:label="ifrs-full_PurchaseOfTreasuryShares" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ext_TotalTransactionsWithShareholders"
                          xlink:to="ifrs-full_PurchaseOfTreasuryShares"
                            weight="-1.0"
                            order="4"
                          xlink:type="arc"/>
   </link:calculationLink>
   <!-- http://www.xbrl.org/2003/arcrole/summation-item https://ternaixbrl.saastagetik.com/xbrl/role/all/ias_7_role-520000 -->
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_IncreaseDecreaseInCashAndCashEquivalents" xlink:label="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" 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_CashFlowsFromUsedInOperatingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"
                          xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                            weight="1.0"
                            order="1"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"
                          xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                            weight="1.0"
                            order="2"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"
                          xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                            weight="1.0"
                            order="3"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_CashFlowsFromUsedInOperatingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities" 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_InterestReceivedClassifiedAsOperatingActivities" xlink:label="ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_InterestReceivedClassifiedAsOperatingActivities"
                            weight="1.0"
                            order="1"
                          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_InterestPaidClassifiedAsOperatingActivities" xlink:label="ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_InterestPaidClassifiedAsOperatingActivities"
                            weight="1.0"
                            order="2"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"
                            weight="1.0"
                            order="3"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_AdjustmentByIncreaseOrDecreaseInInventories" xlink:label="ext_AdjustmentByIncreaseOrDecreaseInInventories" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ext_AdjustmentByIncreaseOrDecreaseInInventories"
                            weight="1.0"
                            order="4"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_AdjustmentsForIncreaseDecreaseInProvisions" xlink:label="ext_AdjustmentsForIncreaseDecreaseInProvisions" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ext_AdjustmentsForIncreaseDecreaseInProvisions"
                            weight="1.0"
                            order="5"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssets" xlink:label="ext_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ext_AdjustmentsForDecreaseIncreaseInOtherNonCurrentAssets"
                            weight="1.0"
                            order="6"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_AdjustmentsForIncreaseDecreaseInOtherNonCurrentLiabilities" xlink:label="ext_AdjustmentsForIncreaseDecreaseInOtherNonCurrentLiabilities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ext_AdjustmentsForIncreaseDecreaseInOtherNonCurrentLiabilities"
                            weight="1.0"
                            order="7"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"
                            weight="1.0"
                            order="8"
                          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_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:label="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables"
                            weight="1.0"
                            order="9"
                          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_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:label="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInOperatingActivities"
                          xlink:to="ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables"
                            weight="1.0"
                            order="10"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_CashFlowsFromUsedInInvestingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities" 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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
                            order="80.0"
                            weight="-1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"
                            order="100.0"
                            weight="-1.0"
                          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_InterestPaidClassifiedAsInvestingActivities" xlink:label="ifrs-full_InterestPaidClassifiedAsInvestingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ifrs-full_InterestPaidClassifiedAsInvestingActivities"
                            order="190.0"
                            weight="-1.0"
                          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_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:label="ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
                            weight="1.0"
                            order="191.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_CashFlowsFromConsiderationPaidForNewAcquisitionsNetOfCash" xlink:label="ext_CashFlowsFromConsiderationPaidForNewAcquisitionsNetOfCash" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ext_CashFlowsFromConsiderationPaidForNewAcquisitionsNetOfCash"
                            weight="1.0"
                            order="192.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_CashFlowsFromMovementsInLongMediumShortTermFinancialInvestments" xlink:label="ext_CashFlowsFromMovementsInLongMediumShortTermFinancialInvestments" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ext_CashFlowsFromMovementsInLongMediumShortTermFinancialInvestments"
                            weight="1.0"
                            order="193.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_AdjustmentsForDecreaseIncreaseInInvestmentsInAssociates" xlink:label="ext_AdjustmentsForDecreaseIncreaseInInvestmentsInAssociates" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
                          xlink:to="ext_AdjustmentsForDecreaseIncreaseInInvestmentsInAssociates"
                            weight="-1.0"
                            order="194.0"
                          xlink:type="arc"/>
   </link:calculationLink>
   <link:calculationLink xlink:role="https://ternaixbrl.saastagetik.com/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_CashFlowsFromUsedInFinancingActivities" xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities" 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_ProceedsFromChangesInOwnershipInterestsInSubsidiaries" xlink:label="ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                          xlink:to="ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries"
                            order="10.0"
                            weight="1.0"
                          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_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                          xlink:to="ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"
                            order="80.0"
                            weight="-1.0"
                          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:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                          xlink:to="ifrs-full_DividendsPaidClassifiedAsFinancingActivities"
                            order="110.0"
                            weight="-1.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_MovementInTheReserveForTreasuryShares" xlink:label="ext_MovementInTheReserveForTreasuryShares" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                          xlink:to="ext_MovementInTheReserveForTreasuryShares"
                            weight="1.0"
                            order="111.0"
                          xlink:type="arc"/>
      <link:loc xlink:href="8156009E94ED54DE7C31-2021-12-31.xsd#ext_RecognitionOfNonControllingInterestsInEquityOfNewlyAcquiredCompanies" xlink:label="ext_RecognitionOfNonControllingInterestsInEquityOfNewlyAcquiredCompanies" xlink:type="locator"/>
      <link:calculationArc
                          xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item"
                          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
                          xlink:to="ext_RecognitionOfNonControllingInterestsInEquityOfNewlyAcquiredCompanies"
                            weight="1.0"
                            order="112.0"
                          xlink:type="arc"/>
   </link:calculationLink>

</link:linkbase>