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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableHeading" order="37.0"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_AverageAnnualReturnCaption" order="38.0"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableTextBlock" order="40.0"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableFootnotesTextBlock" order="41.0"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_RiskReturnAbstract" xlink:to="rr_PerformanceTableClosingTextBlock" order="42.0"/> |
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| | <loc xlink:type="locator" xlink:label="rr_ProspectusTable" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ProspectusTable"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/> |
| | <loc xlink:type="locator" xlink:label="dei_EntityDomain" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/> |
| | <loc xlink:type="locator" xlink:label="rr_ProspectusShareClassAxis" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ProspectusShareClassAxis"/> |
| | <loc xlink:type="locator" xlink:label="rr_ShareClassDomain" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ShareClassDomain"/> |
| | <loc xlink:type="locator" xlink:label="ck0001454889_S000066661Member" xlink:href="ck0001454889-20230428.xsd#ck0001454889_S000066661Member"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="ck0001454889_RiskReturnSummaryAbstract" xlink:to="rr_ProspectusTable" order="0"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="0"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_LegalEntityAxis" xlink:to="ck0001454889_S000066661Member" order="0"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="dei_LegalEntityAxis" xlink:to="dei_EntityDomain" order="1"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusTable" xlink:to="rr_ProspectusShareClassAxis" order="1"/> |
| | <loc xlink:type="locator" xlink:label="ck0001454889_C000214878Member" xlink:href="ck0001454889-20230428.xsd#ck0001454889_C000214878Member"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusShareClassAxis" xlink:to="ck0001454889_C000214878Member" order="0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusShareClassAxis" xlink:to="rr_ShareClassDomain" order="1"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusTable" xlink:to="rr_ShareholderFeesAbstract" order="2"/> |
| | <loc xlink:type="locator" xlink:label="rr_ShareholderFeeOther" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ShareholderFeeOther"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="0" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
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| | <loc xlink:type="locator" xlink:label="ck0001454889_RiskReturnSummaryAbstract" xlink:href="ck0001454889-20230428.xsd#ck0001454889_RiskReturnSummaryAbstract"/> |
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| | <loc xlink:type="locator" xlink:label="rr_ProspectusTable" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ProspectusTable"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusTable" xlink:to="dei_LegalEntityAxis" order="0"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ProspectusTable" xlink:to="rr_OperatingExpensesAbstract" order="2"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="0" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
| | <loc xlink:type="locator" xlink:label="rr_OtherExpensesOverAssets" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_OtherExpensesOverAssets"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="1" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
| | <loc xlink:type="locator" xlink:label="rr_ExpensesOverAssets" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ExpensesOverAssets"/> |
| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ExpensesOverAssets" order="2" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
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| | <loc xlink:type="locator" xlink:label="ck0001454889_RiskReturnSummaryAbstract" xlink:href="ck0001454889-20230428.xsd#ck0001454889_RiskReturnSummaryAbstract"/> |
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| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ShareholderFeesAbstract" xlink:to="rr_ShareholderFeeOther" order="0" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_ManagementFeesOverAssets" order="0" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_OperatingExpensesAbstract" xlink:to="rr_OtherExpensesOverAssets" order="1" preferredLabel="http://www.xbrl.org/2003/role/label"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleByYearColumnName" order="0" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear01" order="1" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear03" order="2" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear05" order="3" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
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| | <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="rr_ExpenseExampleAbstract" xlink:to="rr_ExpenseExampleYear10" order="4" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/> |
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| | <loc xlink:type="locator" xlink:label="rr_ProspectusTable" xlink:href="https://xbrl.sec.gov/rr/2023/rr-2023.xsd#rr_ProspectusTable"/> |
| | <loc xlink:type="locator" xlink:label="dei_LegalEntityAxis" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/> |
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| | <loc xlink:type="locator" xlink:label="ck0001454889_S000066660Member" xlink:href="ck0001454889-20230428.xsd#ck0001454889_S000066660Member"/> |
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