<?xml version="1.0" encoding="US-ASCII"?>
<!-- Generated by Broadridge Transform (tm) - http://www.broadridge.com -->
<!-- Created: Wed Aug 26 19:29:56 UTC 2026 -->
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_C000259986Member_lbl" xml:lang="en-US">CORE16 Best of Breed Premier Index ETF</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_EarlyCloseTradingHaltRiskMember_lbl" xml:lang="en-US">Early Close/Trading Halt Risk [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_EmergingMarketsSecuritiesRiskMember_lbl" xml:lang="en-US">Emerging Markets Securities Risk [Member]</label>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_IndexConcentrationRiskMember_lbl" xml:lang="en-US">Index Concentration Risk [Member]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_GrowthSecuritiesInvestmentRiskMember" xlink:to="ck0001452937_GrowthSecuritiesInvestmentRiskMember_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_InflationProtectedSecuritiesRiskMember" xlink:to="ck0001452937_InflationProtectedSecuritiesRiskMember_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_IssuerSpecificRiskMember" xlink:to="ck0001452937_IssuerSpecificRiskMember_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_LiquidityRiskMember" xlink:to="ck0001452937_LiquidityRiskMember_lbl"/>
    <loc xlink:type="locator" xlink:label="ck0001452937_LargeCapitalizationCompaniesRiskMember" xlink:href="ck0001452937-20260430.xsd#ck0001452937_LargeCapitalizationCompaniesRiskMember"/>
    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_LargeCapitalizationCompaniesRiskMember_lbl" xml:lang="en-US">Large Capitalization Companies Risk [Member]</label>
    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_LargeCapitalizationCompaniesRiskMember" xlink:to="ck0001452937_LargeCapitalizationCompaniesRiskMember_lbl"/>
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    <label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:label="ck0001452937_MarketCapitalizationDeviationRiskMember_lbl" xml:lang="en-US">Market Capitalization Deviation Risk [Member]</label>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_LimitedAuthorizedParticipantsMember" xlink:to="ck0001452937_LimitedAuthorizedParticipantsMember_lbl"/>
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    <labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ck0001452937_ManagementRiskMember" xlink:to="ck0001452937_ManagementRiskMember_lbl"/>
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