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        </lineOfCredit>
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        <isInterfundBorrowing>N</isInterfundBorrowing>
        <isSwingPricing>N</isSwingPricing>
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    </managementInvestmentQuestionSeriesInfo>
    <attachmentsTab>
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      <isProvisionFinancialSupport>false</isProvisionFinancialSupport>
      <isIPAReportInternalControl>true</isIPAReportInternalControl>
      <isChangeAccPrinciples>false</isChangeAccPrinciples>
      <isInfoRequiredEO>false</isInfoRequiredEO>
      <isOtherInfoRequired>false</isOtherInfoRequired>
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    <signature registrantSignedName="Pioneer High Yield Fund" signedDate="2019-01-14" signature="MARK E. BRADLEY" title="TREASURER AND CHIEF FINANCIAL AND ACCOUNTING OFFICER"/>
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</edgarSubmission>
