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  <xs:element id="ck0001032423_BloombergUSAggregateBondIndexIndexMember" abstract="true" name="BloombergUSAggregateBondIndexIndexMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="ck0001032423_BloombergUS13YearGovernmentCreditIndexIndexMember" abstract="true" name="BloombergUS13YearGovernmentCreditIndexIndexMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
