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        <name>Illinois Sports Facilities Authority (The)</name>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Massachusetts Development Finance Agency</name>
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      <invstOrSec>
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          <maturityDt>2028-08-01</maturityDt>
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          <maturityDt>2038-11-01</maturityDt>
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        <isRestrictedSec>N</isRestrictedSec>

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          <maturityDt>2035-07-01</maturityDt>
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          <isin value="US57584YC233"/>
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        <name>Puerto Rico Electric Power Authority</name>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>Puerto Rico Highway &amp; Transportation Authority</name>
        <lei>549300J6QBXVWJXB7Y41</lei>
        <title>Puerto Rico Highway &amp; Transportation Authority</title>
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          <isin value="US745190N207"/>
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        <curCd>USD</curCd>
        <valUSD>45525.60000000</valUSD>
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        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2038-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</name>
        <lei>N/A</lei>
        <title>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</title>
        <cusip>745272EZ3</cusip>
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          <isin value="US745272EZ30"/>
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        <curCd>USD</curCd>
        <valUSD>108517.20000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-04-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.12500000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
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          <isin value="US74526QPM86"/>
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        <balance>220000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>233120.80000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
        <title>Puerto Rico Sales Tax Financing Corp. Sales Tax</title>
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        <identifiers>
          <isin value="US74529JRH04"/>
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        <balance>671000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>727122.44000000</valUSD>
        <pctVal>0.187019387031</pctVal>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2040-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.32900000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Massachusetts Bay Transportation Authority</name>
        <lei>549300D2U0XBUXGX8P68</lei>
        <title>Massachusetts Bay Transportation Authority</title>
        <cusip>575579QA8</cusip>
        <identifiers>
          <isin value="US575579QA85"/>
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        <balance>1850000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>2531188.50000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57583RJF3</cusip>
        <identifiers>
          <isin value="US57583RJF38"/>
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        <balance>2250000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>2603137.50000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2026-10-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57584XFM8</cusip>
        <identifiers>
          <isin value="US57584XFM83"/>
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        <balance>170000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>170455.60000000</valUSD>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2037-05-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Massachusetts Transportation Trust Fund Metropolitan Highway System Revenue</name>
        <lei>N/A</lei>
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          <isin value="US57563CFK36"/>
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        <balance>3000000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>3896220.00000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2035-01-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
          <isDefault>N</isDefault>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
        <cusip>57584YWH8</cusip>
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          <isin value="US57584YWH88"/>
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        <balance>525000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>600631.50000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2042-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Puerto Rico Highway &amp; Transportation Authority</name>
        <lei>549300J6QBXVWJXB7Y41</lei>
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          <isin value="US745190ZN12"/>
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        <curCd>USD</curCd>
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        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
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          <isin value="US74526QV338"/>
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        <balance>125000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>100937.50000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2042-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Massachusetts Bay Transportation Authority</name>
        <lei>549300D2U0XBUXGX8P68</lei>
        <title>Massachusetts Bay Transportation Authority</title>
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          <isin value="US575579QC42"/>
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        <balance>2000000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>2864800.00000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
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          <isin value="US74529JPX71"/>
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        <invCountry>PR</invCountry>

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          <couponKind>Fixed</couponKind>
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        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
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        <cusip>74526QR20</cusip>
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          <isin value="US74526QR203"/>
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        <balance>25000.00000000</balance>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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      <invstOrSec>
        <name>N/A</name>
        <lei>N/A</lei>
        <title>U.S. Treasury Long Bond</title>
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          <other otherDesc="Inhouse Sedol" value="USH1COS"/>
          <other otherDesc="Future Ticker" value="USH1 Comdty"/>
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      <invstOrSec>
        <name>Massachusetts State College Building Authority</name>
        <lei>N/A</lei>
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          <isin value="US575832KK58"/>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <couponKind>None</couponKind>
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        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
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          <isin value="US74526QU595"/>
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        <balance>190000.00000000</balance>
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        <curCd>USD</curCd>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
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        <name>Railsplitter Tobacco Settlement Authority</name>
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          <maturityDt>2026-06-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Massachusetts Port Authority</name>
        <lei>254900JRR8IDSSKWCL90</lei>
        <title>Massachusetts Port Authority</title>
        <cusip>575896TN5</cusip>
        <identifiers>
          <isin value="US575896TN59"/>
        </identifiers>
        <balance>2755000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>3482292.45000000</valUSD>
        <pctVal>0.895662358409</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2040-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Texas Municipal Gas Acquisition &amp; Supply Corp. III</name>
        <lei>0UDITKOYW0YKG3BBP242</lei>
        <title>Texas Municipal Gas Acquisition &amp; Supply Corp. III</title>
        <cusip>88256HAT5</cusip>
        <identifiers>
          <isin value="US88256HAT59"/>
        </identifiers>
        <balance>160000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>171244.80000000</valUSD>
        <pctVal>0.044044985777</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-12-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>New York Liberty Development Corp.</name>
        <lei>N/A</lei>
        <title>New York Liberty Development Corp.</title>
        <cusip>649519CK9</cusip>
        <identifiers>
          <isin value="US649519CK93"/>
        </identifiers>
        <balance>1095000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1147724.25000000</valUSD>
        <pctVal>0.295200194503</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2040-09-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Massachusetts Bay Transportation Authority</name>
        <lei>549300D2U0XBUXGX8P68</lei>
        <title>Massachusetts Bay Transportation Authority</title>
        <cusip>575579E60</cusip>
        <identifiers>
          <isin value="US575579E601"/>
        </identifiers>
        <balance>500000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>517505.00000000</valUSD>
        <pctVal>0.133104773778</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2021-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Buckeye Tobacco Settlement Financing Authority</name>
        <lei>N/A</lei>
        <title>Buckeye Tobacco Settlement Financing Authority</title>
        <cusip>118217DA3</cusip>
        <identifiers>
          <isin value="US118217DA38"/>
        </identifiers>
        <balance>4885000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>743692.40000000</valUSD>
        <pctVal>0.191281260399</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2057-06-01</maturityDt>
          <couponKind>None</couponKind>
          <annualizedRt>0.00000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="All applicable monthly total returns are reported excluding any sales loads or redemption fees for Item B.5." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2021-02-01</ncom:dateSigned>
      <ncom:nameOfApplicant>MFS Municipal Series Trust</ncom:nameOfApplicant>
      <ncom:signature>Kasey Phillips</ncom:signature>
      <ncom:signerName>Kasey Phillips</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
