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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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        <name>Massachusetts Development Finance Agency</name>
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          <isin value="US57583F3Q20"/>
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          <maturityDt>2023-12-15</maturityDt>
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          <isin value="US57584XDR98"/>
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          <maturityDt>2031-05-01</maturityDt>
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        <fairValLevel>2</fairValLevel>
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          <annualizedRt>4.95000000</annualizedRt>
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        <name>Massachusetts Clean Water Trust (The)</name>
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          <isin value="US57604PB783"/>
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          <maturityDt>2027-08-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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        <name>Woods Hole Marthas Vineyard &amp; Nantucket Steamship Authority</name>
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          <isin value="US980116LM70"/>
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          <maturityDt>2028-03-01</maturityDt>
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          <annualizedRt>4.00000000</annualizedRt>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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          <isin value="US745190N207"/>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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        <name>Massachusetts Development Finance Agency</name>
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          <isin value="US57584XGY13"/>
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        <name>Tuscaloosa County Industrial Development Authority</name>
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        <name>New Jersey Transportation Trust Fund Authority</name>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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        <name>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</name>
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        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
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        <name>Illinois Sports Facilities Authority (The)</name>
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        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
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          <isin value="US74526QQ544"/>
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        <curCd>USD</curCd>
        <valUSD>160425.00000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2026-07-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
        <cusip>74526QU59</cusip>
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          <isin value="US74526QU595"/>
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        <balance>190000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>131812.50000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>6.05000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>Texas Municipal Gas Acquisition &amp; Supply Corp. III</name>
        <lei>0UDITKOYW0YKG3BBP242</lei>
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          <isin value="US88256HAT59"/>
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        <curCd>USD</curCd>
        <valUSD>170001.60000000</valUSD>
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        <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>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      </invstOrSec>
      <invstOrSec>
        <name>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCR4</cusip>
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          <isin value="US79467BCR42"/>
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        <balance>140000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>162108.80000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2026-01-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</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>Territory of Guam</name>
        <lei>N/A</lei>
        <title>Territory of Guam</title>
        <cusip>40065HDV9</cusip>
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          <isin value="US40065HDV96"/>
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        <balance>370000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>399958.90000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>GU</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2046-12-01</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>Montgomery County Housing Opportunites Commission</name>
        <lei>549300HDL0LLRHMDL092</lei>
        <title>Montgomery County Housing Opportunites Commission</title>
        <cusip>613353AV3</cusip>
        <identifiers>
          <isin value="US613353AV30"/>
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        <balance>1850000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>2053518.50000000</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>2049-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Metropolitan Boston Transit Parking Corp.</name>
        <lei>N/A</lei>
        <title>Metropolitan Boston Transit Parking Corp.</title>
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          <isin value="US59180CAL54"/>
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        <balance>3000000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>3096720.00000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2036-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
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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>57584XJ36</cusip>
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          <isin value="US57584XJ362"/>
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        <balance>2000000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>2147860.00000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2046-10-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
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          <isin value="US57584YSC48"/>
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        <balance>250000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>291180.00000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2033-01-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>6.00000000</annualizedRt>
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      <invstOrSec>
        <name>New Jersey Economic Development Authority</name>
        <lei>5493006JS6QWDVU4R678</lei>
        <title>New Jersey Economic Development Authority</title>
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          <isin value="US64577B7P37"/>
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        <curCd>USD</curCd>
        <valUSD>852493.05000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2039-06-15</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Massachusetts Housing Finance Agency</name>
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        <title>Massachusetts Housing Finance Agency</title>
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          <isin value="US57586YBA47"/>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2035-12-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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      <invstOrSec>
        <name>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCS2</cusip>
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          <isin value="US79467BCS25"/>
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        <balance>310000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>365170.70000000</valUSD>
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        <invCountry>US</invCountry>
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        <debtSec>
          <maturityDt>2027-01-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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      <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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          <isin value="US74529JQB43"/>
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        <balance>12000.00000000</balance>
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        <curCd>USD</curCd>
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        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2024-07-01</maturityDt>
          <couponKind>None</couponKind>
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        <name>Massachusetts Port Authority</name>
        <lei>254900JRR8IDSSKWCL90</lei>
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        <invCountry>US</invCountry>
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          <maturityDt>2041-07-01</maturityDt>
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          <annualizedRt>5.12500000</annualizedRt>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
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        <invCountry>PR</invCountry>

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          <maturityDt>2040-07-01</maturityDt>
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          <annualizedRt>4.55000000</annualizedRt>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
        <lei>549300UZSVMFXJK08K70</lei>
        <title>Massachusetts Development Finance Agency</title>
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          <isin value="US57584XW563"/>
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        <invCountry>US</invCountry>
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          <maturityDt>2032-01-01</maturityDt>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
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        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2021-07-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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      <invstOrSec>
        <name>Massachusetts Development Finance Agency</name>
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        <title>Massachusetts Development Finance Agency</title>
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        <balance>1000000.00000000</balance>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <debtSec>
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        <name>University of Massachusetts Building Authority</name>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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        <name>Buckeye Tobacco Settlement Financing Authority</name>
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        <name>Massachusetts Transportation Trust Fund Metropolitan Highway System Revenue</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>New York City Transitional Finance Authority Future Tax Secured Revenue</name>
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        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-08-01</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>Delaware Valley Regional Finance Authority</name>
        <lei>549300HGYP3NW885TT18</lei>
        <title>Delaware Valley Regional Finance Authority</title>
        <cusip>246579JK3</cusip>
        <identifiers>
          <isin value="US246579JK31"/>
        </identifiers>
        <balance>1400000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1234660.00000000</valUSD>
        <pctVal>0.335464302155</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2037-06-01</maturityDt>
          <couponKind>Floating</couponKind>
          <annualizedRt>0.98399800</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>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
        <cusip>74526QPS5</cusip>
        <identifiers>
          <isin value="US74526QPS56"/>
        </identifiers>
        <balance>35000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>35729.40000000</valUSD>
        <pctVal>0.009707885764</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2034-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</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>118217CZ9</cusip>
        <identifiers>
          <isin value="US118217CZ97"/>
        </identifiers>
        <balance>2000000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>2105980.00000000</valUSD>
        <pctVal>0.572207013309</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2055-06-01</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>
    </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>2020-07-30</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>
