﻿<?xml version="1.0" encoding="UTF-8"?><link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:xlink="http://www.w3.org/1999/xlink"><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel" /><link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel" /><link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link"><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:label="NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:label xlink:type="resource" xlink:label="label_VIO_NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers_Label" xml:lang="el">Μη κυκλοφορούντα περιουσιακά στοιχεία που αναγνωρίζονται από το κόστος απόκτησης ή εκπλήρωσης συμβάσεων με πελάτες</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:to="label_VIO_NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="Label: NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers to label_VIO_NonCurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:label="CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:label xlink:type="resource" xlink:label="label_VIO_CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers_Label" xml:lang="el">Τρέχοντα περιουσιακά στοιχεία που αναγνωρίζονται από το κόστος απόκτησης ή εκπλήρωσης συμβάσεων με πελάτες</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:to="label_VIO_CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="Label: CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers to label_VIO_CurrentAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="CashAndCashEquivalents" xlink:title="CashAndCashEquivalents" /><link:label xlink:type="resource" xlink:label="label_ifrs-full_CashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:title="CashAndCashEquivalents_Label" xml:lang="el">Ταμειακά διαθέσιμα και ισοδύναμα στην αρχή της περιόδου</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalents" xlink:to="label_ifrs-full_CashAndCashEquivalents" xlink:title="Label: CashAndCashEquivalents to label_ifrs-full_CashAndCashEquivalents" /><link:label xlink:type="resource" xlink:label="label_ifrs-full_CashAndCashEquivalents_2" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:title="CashAndCashEquivalents_Label" xml:lang="el">Ταμειακά διαθέσιμα και ισοδύναμα στο τέλος της περιόδου</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CashAndCashEquivalents" xlink:to="label_ifrs-full_CashAndCashEquivalents_2" xlink:title="Label: CashAndCashEquivalents to label_ifrs-full_CashAndCashEquivalents_2" /><link:loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2019-03-27/full_ifrs/full_ifrs-cor_2019-03-27.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity" /><link:label xlink:type="resource" xlink:label="label_ifrs-full_Equity" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel" xlink:title="Equity_Label" xml:lang="el">Ίδια κεφάλαια στην αρχή της περιόδου</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Equity" xlink:to="label_ifrs-full_Equity" xlink:title="Label: Equity to label_ifrs-full_Equity" /><link:label xlink:type="resource" xlink:label="label_ifrs-full_Equity_2" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:title="Equity_Label" xml:lang="el">Ίδια κεφάλαια στο τέλος της περιόδου</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Equity" xlink:to="label_ifrs-full_Equity_2" xlink:title="Label: Equity to label_ifrs-full_Equity_2" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_SellingExpenseAndDistributionCosts" xlink:label="SellingExpenseAndDistributionCosts" xlink:title="SellingExpenseAndDistributionCosts" /><link:label xlink:type="resource" xlink:label="label_VIO_SellingExpenseAndDistributionCosts" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="SellingExpenseAndDistributionCosts_Label" xml:lang="el">Έξοδα πώλησης και κόστος διανομής</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SellingExpenseAndDistributionCosts" xlink:to="label_VIO_SellingExpenseAndDistributionCosts" xlink:title="Label: SellingExpenseAndDistributionCosts to label_VIO_SellingExpenseAndDistributionCosts" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_IncreaseDecreaseThroughMergersAndAbsorptions" xlink:label="IncreaseDecreaseThroughMergersAndAbsorptions" xlink:title="IncreaseDecreaseThroughMergersAndAbsorptions" /><link:label xlink:type="resource" xlink:label="label_VIO_IncreaseDecreaseThroughMergersAndAbsorptions" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="IncreaseDecreaseThroughMergersAndAbsorptions_Label" xml:lang="el">Αύξηση (μείωση) μέσω συγχωνεύσεων και απορροφήσεων</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="IncreaseDecreaseThroughMergersAndAbsorptions" xlink:to="label_VIO_IncreaseDecreaseThroughMergersAndAbsorptions" xlink:title="Label: IncreaseDecreaseThroughMergersAndAbsorptions to label_VIO_IncreaseDecreaseThroughMergersAndAbsorptions" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AcquisitionOfNonControllingInterests" xlink:label="AcquisitionOfNonControllingInterests" xlink:title="AcquisitionOfNonControllingInterests" /><link:label xlink:type="resource" xlink:label="label_VIO_AcquisitionOfNonControllingInterests" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AcquisitionOfNonControllingInterests_Label" xml:lang="el">Απόκτηση μη ελεγχόμενων συμφερόντων</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AcquisitionOfNonControllingInterests" xlink:to="label_VIO_AcquisitionOfNonControllingInterests" xlink:title="Label: AcquisitionOfNonControllingInterests to label_VIO_AcquisitionOfNonControllingInterests" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_OtherChangesInOwnershipInterest" xlink:label="OtherChangesInOwnershipInterest" xlink:title="OtherChangesInOwnershipInterest" /><link:label xlink:type="resource" xlink:label="label_VIO_OtherChangesInOwnershipInterest" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="OtherChangesInOwnershipInterest_Label" xml:lang="el">Άλλες αλλαγές στα δικαιώματα ιδιοκτησίας</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OtherChangesInOwnershipInterest" xlink:to="label_VIO_OtherChangesInOwnershipInterest" xlink:title="Label: OtherChangesInOwnershipInterest to label_VIO_OtherChangesInOwnershipInterest" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForDepreciationPropertyPlantAndEquipment" xlink:label="AdjustmentsForDepreciationPropertyPlantAndEquipment" xlink:title="AdjustmentsForDepreciationPropertyPlantAndEquipment" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForDepreciationPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForDepreciationPropertyPlantAndEquipment_Label" xml:lang="el">Προσαρμογές απόσβεσης, ακινήτων, εγκαταστάσεων και εξοπλισμού</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDepreciationPropertyPlantAndEquipment" xlink:to="label_VIO_AdjustmentsForDepreciationPropertyPlantAndEquipment" xlink:title="Label: AdjustmentsForDepreciationPropertyPlantAndEquipment to label_VIO_AdjustmentsForDepreciationPropertyPlantAndEquipment" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForDepreciationRightOfUseAssets" xlink:label="AdjustmentsForDepreciationRightOfUseAssets" xlink:title="AdjustmentsForDepreciationRightOfUseAssets" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForDepreciationRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForDepreciationRightOfUseAssets_Label" xml:lang="el">Προσαρμογές για απόσβεση, περιουσιακά στοιχεία δικαιώματος χρήσης</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDepreciationRightOfUseAssets" xlink:to="label_VIO_AdjustmentsForDepreciationRightOfUseAssets" xlink:title="Label: AdjustmentsForDepreciationRightOfUseAssets to label_VIO_AdjustmentsForDepreciationRightOfUseAssets" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForDepreciationInvestmentProperty" xlink:label="AdjustmentsForDepreciationInvestmentProperty" xlink:title="AdjustmentsForDepreciationInvestmentProperty" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForDepreciationInvestmentProperty" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForDepreciationInvestmentProperty_Label" xml:lang="el">Προσαρμογές για απόσβεση, επένδυση σε ακίνητα</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDepreciationInvestmentProperty" xlink:to="label_VIO_AdjustmentsForDepreciationInvestmentProperty" xlink:title="Label: AdjustmentsForDepreciationInvestmentProperty to label_VIO_AdjustmentsForDepreciationInvestmentProperty" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" xlink:label="AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" xlink:title="AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty_Label" xml:lang="el">Προσαρμογές για ζημίες απομείωσης (αντιστροφή ζημίας απομείωσης) που αναγνωρίζονται στα αποτελέσματα, επενδύσεις σε ακίνητα</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" xlink:to="label_VIO_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" xlink:title="Label: AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty to label_VIO_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInvestmentProperty" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:label="AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:title="AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets_Label" xml:lang="el">Προσαρμογές για απώλειες (κέρδη) από διάθεση περιουσιακών στοιχείων, εγκαταστάσεων και εξοπλισμού και άυλων περιουσιακών στοιχείων</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:to="label_VIO_AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" xlink:title="Label: AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets to label_VIO_AdjustmentsForLossesGainsOnDisposalOfPropertyPlantAndEquipmentAndIntangibleAssets" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" xlink:label="AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" xlink:title="AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties_Label" xml:lang="el">Προσαρμογές για κέρδη (ζημίες) από την πώληση επενδυτικών ακινήτων</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" xlink:to="label_VIO_AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" xlink:title="Label: AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties to label_VIO_AdjustmentsForGainsLossesOnDisposalsOfInvestmentProperties" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForAmortisationExpenseGovernmentGrants" xlink:label="AdjustmentsForAmortisationExpenseGovernmentGrants" xlink:title="AdjustmentsForAmortisationExpenseGovernmentGrants" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForAmortisationExpenseGovernmentGrants" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForAmortisationExpenseGovernmentGrants_Label" xml:lang="el">Προσαρμογές για έξοδα απόσβεσης, κρατικές επιχορηγήσεις</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForAmortisationExpenseGovernmentGrants" xlink:to="label_VIO_AdjustmentsForAmortisationExpenseGovernmentGrants" xlink:title="Label: AdjustmentsForAmortisationExpenseGovernmentGrants to label_VIO_AdjustmentsForAmortisationExpenseGovernmentGrants" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" xlink:label="AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" xlink:title="AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9_Label" xml:lang="el">Προσαρμογές για απώλεια απομείωσης (κέρδος απομείωσης και αντιστροφή ζημίας απομείωσης) που προσδιορίζονται σύμφωνα με το ΔΠΧΑ 9</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" xlink:to="label_VIO_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" xlink:title="Label: AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9 to label_VIO_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIfrs9" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForGainsLossesFromBusinessCombinations" xlink:label="AdjustmentsForGainsLossesFromBusinessCombinations" xlink:title="AdjustmentsForGainsLossesFromBusinessCombinations" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForGainsLossesFromBusinessCombinations" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForGainsLossesFromBusinessCombinations_Label" xml:lang="el">Προσαρμογές για κέρδη (ζημίες) από συνενώσεις επιχειρήσεων</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForGainsLossesFromBusinessCombinations" xlink:to="label_VIO_AdjustmentsForGainsLossesFromBusinessCombinations" xlink:title="Label: AdjustmentsForGainsLossesFromBusinessCombinations to label_VIO_AdjustmentsForGainsLossesFromBusinessCombinations" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForDecreaseIncreaseInContractAssets" xlink:label="AdjustmentsForDecreaseIncreaseInContractAssets" xlink:title="AdjustmentsForDecreaseIncreaseInContractAssets" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForDecreaseIncreaseInContractAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForDecreaseIncreaseInContractAssets_Label" xml:lang="el">Προσαρμογές για μείωση (αύξηση) στο ενεργητικό της σύμβασης</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDecreaseIncreaseInContractAssets" xlink:to="label_VIO_AdjustmentsForDecreaseIncreaseInContractAssets" xlink:title="Label: AdjustmentsForDecreaseIncreaseInContractAssets to label_VIO_AdjustmentsForDecreaseIncreaseInContractAssets" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:label="AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers_Label" xml:lang="el">Προσαρμογές για μείωση (αύξηση) περιουσιακών στοιχείων που αναγνωρίζονται από το κόστος απόκτησης ή εκπλήρωσης συμβάσεων με πελάτες</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:to="label_VIO_AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" xlink:title="Label: AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers to label_VIO_AdjustmentsForDecreaseIncreaseInAssetsRecognisedFromCostsToObtainOrFulfilContractsWithCustomers" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_AdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:label="AdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:title="AdjustmentsForIncreaseDecreaseInContractLiabilities" /><link:label xlink:type="resource" xlink:label="label_VIO_AdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" 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xlink:label="label_VIO_PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_Label" xml:lang="el">Αγορά ακινήτων, εγκαταστάσεων και εξοπλισμού και αγορά άυλων περιουσιακών στοιχείων, ταξινομημένα ως επενδυτικές δραστηριότητες</link:label><link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:to="label_VIO_PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="Label: PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities to label_VIO_PurchaseOfPropertyPlantAndEquipmentAndPurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" /><link:loc xlink:type="locator" xlink:href="549300U0BOLVY36TGJ31-2020-12-31.xsd#VIO_ProceedsFromSalesOfPropertyPlantAndEquipmentAndProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="ProceedsFromSalesOfPropertyPlantAndEquipmentAndProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:title="ProceedsFromSalesOfPropertyPlantAndEquipmentAndProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities" /><link:label xlink:type="resource" xlink:label="label_VIO_ProceedsFromSalesOfPropertyPlantAndEquipmentAndProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:title="ProceedsFromSalesOfPropertyPlantAndEquipmentAndProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities_Label" xml:lang="el">Τα έσοδα από πωλήσεις ακινήτων, εγκαταστάσεων και εξοπλισμού και έσοδα από πωλήσεις άυλων περιουσιακών στοιχείων, ταξινομημένα ως επενδυτικές δραστηριότητες</link:label><link:labelArc 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