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    <element name="MaximumFuturePaymentsForLettersOfCreditUncommittedFacility" id="aep_MaximumFuturePaymentsForLettersOfCreditUncommittedFacility" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
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    <element name="Oklahoma2014BaseRateCaseMember" id="aep_Oklahoma2014BaseRateCaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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</schema>
