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  <xs:element name="MarketRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000205007_MarketRiskMember"/>  
  <xs:element name="RepurchaseAgreementRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000205007_RepurchaseAgreementRiskMember"/>   
  <xs:element name="YieldRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000205007_YieldRiskMember"/>     
  <xs:element name="ManagementRiskMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="ck0000205007_ManagementRiskMember"/>     
</xs:schema>
