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      <link:loc xlink:type="locator" xlink:href="ck0000795264-20260531.xsd#ck0000795264_TransCanadaPipeLinesLtdMember" xlink:label="ck0000795264_TransCanadaPipeLinesLtdMember" />
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      <link:loc xlink:type="locator" xlink:href="ck0000795264-20260531.xsd#ck0000795264_MorganStanleyBankOfAmericaMerrillLynchTrustMember" xlink:label="ck0000795264_MorganStanleyBankOfAmericaMerrillLynchTrustMember" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember" xlink:label="us-gaap_ResidentialMortgageBackedSecuritiesMember" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StandardPoorsAARatingMember_lbl" xml:lang="en-US">AA Rating [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="srt_StandardPoorsBBBRatingMember_lbl" xml:lang="en-US">BBB Rating [Member]</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="ck0000795264_StandardPoorsBBandBelowMember_lbl" xml:lang="en-US">BB and Below [Member]</link:label>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet" xlink:label="us-gaap_AssetsNet" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="us-gaap_AssetsNet_lbl" xml:lang="en-US">Net Assets</link:label>
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