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          <maturityDt>2036-04-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Maryland Stadium Authority Built to Learn Revenue</name>
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          <maturityDt>2041-06-01</maturityDt>
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        <name>Maryland Economic Development Corp.</name>
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          <maturityDt>2031-06-01</maturityDt>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Maryland Economic Development Corp.</name>
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        <name>Cobb County Kennestone Hospital Authority</name>
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        <name>MFS Institutional Money Market Portfolio</name>
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        <name>Maryland Economic Development Corp.</name>
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      <invstOrSec>
        <name>County of Baltimore MD</name>
        <lei>N/A</lei>
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        <name>Massachusetts Development Finance Agency</name>
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          <maturityDt>2051-07-01</maturityDt>
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        <name>Iowa Student Loan Liquidity Corp.</name>
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          <maturityDt>2039-12-01</maturityDt>
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          <annualizedRt>3.00000000</annualizedRt>
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        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2029-07-01</maturityDt>
          <couponKind>None</couponKind>
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        <name>Puerto Rico Electric Power Authority</name>
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          <maturityDt>2021-07-01</maturityDt>
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        <name>Maryland Stadium Authority</name>
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          <maturityDt>2041-05-01</maturityDt>
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        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2031-01-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Maryland Stadium Authority Built to Learn Revenue</name>
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        <name>Anaheim City School District</name>
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      <invstOrSec>
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        <name>Maryland Community Development Administration</name>
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        <name>HTA CL 6 Trust</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Washington Metropolitan Area Transit Authority</name>
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        <name>Maryland Economic Development Corp.</name>
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        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>New York Liberty Development Corp.</name>
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        <name>Maryland Community Development Administration</name>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>New Jersey Higher Education Student Assistance Authority</name>
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      <invstOrSec>
        <name>New Hampshire Business Finance Authority</name>
        <lei>N/A</lei>
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        <fairValLevel>2</fairValLevel>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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        <invCountry>PR</invCountry>

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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2024-07-01</maturityDt>
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      <invstOrSec>
        <name>Golden State Tobacco Securitization Corp.</name>
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          <isin value="US38122ND823"/>
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          <annualizedRt>3.85000000</annualizedRt>
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        <name>County of Anne Arundel MD</name>
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        <fairValLevel>2</fairValLevel>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Maryland Economic Development Corp.</name>
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          <maturityDt>2028-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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          <maturityDt>2025-12-01</maturityDt>
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        <fairValLevel>2</fairValLevel>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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          <maturityDt>2046-12-01</maturityDt>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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          <maturityDt>2046-06-01</maturityDt>
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        <name>Montgomery County Housing Opportunities Commission</name>
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        <name>Puerto Rico Electric Power Authority</name>
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          <maturityDt>2020-07-01</maturityDt>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Public Finance Authority</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Maryland Stadium Authority</name>
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        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Guam Government Waterworks Authority</name>
        <lei>N/A</lei>
        <title>Guam Government Waterworks Authority</title>
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          <isin value="US40065FDF80"/>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>GU</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2050-01-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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        <securityLending>
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      <invstOrSec>
        <name>City of Rockville MD</name>
        <lei>N/A</lei>
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          <isin value="US774223BV29"/>
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        <curCd>USD</curCd>
        <valUSD>311565.17000000</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>2042-11-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>County of Frederick MD</name>
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          <isin value="US35571LBN73"/>
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        <curCd>USD</curCd>
        <valUSD>868308.25000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2026-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Spartanburg Regional Health Services District</name>
        <lei>549300CVHLQ72HQF3340</lei>
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          <isin value="US847113CG08"/>
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        <balance>635000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>577302.88000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2043-04-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QZS47"/>
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        <balance>50000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>36375.00000000</valUSD>
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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>
          <annualizedRt>6.05000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</name>
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        <title>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</title>
        <cusip>745272FP4</cusip>
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          <isin value="US745272FP49"/>
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        <curCd>USD</curCd>
        <valUSD>85106.12000000</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>2031-10-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>West Virginia Housing Development Fund</name>
        <lei>N/A</lei>
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          <isin value="US95662NHB73"/>
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        <balance>1000000.00000000</balance>
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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>2052-11-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.85000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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          <isin value="US574218E748"/>
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        <curCd>USD</curCd>
        <valUSD>467541.63000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2033-06-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Texas Municipal Power Agency</name>
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          <isin value="US882555ZR91"/>
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        <balance>555000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>459247.52000000</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>2033-09-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>2.00000000</annualizedRt>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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        <assetCat>DBT</assetCat>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2027-07-01</maturityDt>
          <couponKind>None</couponKind>
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      <invstOrSec>
        <name>County of Frederick MD</name>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2039-07-01</maturityDt>
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        <name>Commonwealth of Puerto Rico</name>
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        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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          <maturityDt>2033-07-01</maturityDt>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Metropolitan Transportation Authority</name>
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        <name>Black Belt Energy Gas District</name>
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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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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Tennessee Energy Acquisition Corp.</name>
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          <isin value="US880443BQ82"/>
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          <maturityDt>2023-09-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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        <name>County of Howard MD</name>
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          <isin value="US44256PTH63"/>
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          <maturityDt>2048-02-15</maturityDt>
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          <annualizedRt>4.00000000</annualizedRt>
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      <invstOrSec>
        <name>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
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          <isin value="US79467BCT08"/>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Commonwealth of Puerto Rico</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Commonwealth of Puerto Rico</name>
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        <name>Guam Government Waterworks Authority</name>
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      <invstOrSec>
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      <invstOrSec>
        <name>New York City Housing Development Corp.</name>
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          <isin value="US64972EA740"/>
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        <fairValLevel>2</fairValLevel>
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      <invstOrSec>
        <name>Maryland Economic Development Corp.</name>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2035-06-01</maturityDt>
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        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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          <isin value="US74529JRJ69"/>
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        <invCountry>PR</invCountry>

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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2040-07-01</maturityDt>
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          <annualizedRt>4.32900000</annualizedRt>
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      <invstOrSec>
        <name>Matching Fund Special Purpose Securitization Corp.</name>
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          <isin value="US57665NAB10"/>
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        <invCountry>VI</invCountry>

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        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QXB30"/>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2018-07-01</maturityDt>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Puerto Rico Sales Tax Financing Corp. Sales Tax Revenue</name>
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        <name>City of Baltimore MD</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Metropolitan Washington Airports Authority Aviation Revenue</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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          <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>Commonwealth of Puerto Rico</name>
        <lei>549300X44HXPLJU48U63</lei>
        <title>Commonwealth of Puerto Rico</title>
        <cusip>74514L3P0</cusip>
        <identifiers>
          <isin value="US74514L3P07"/>
        </identifiers>
        <balance>150243.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>112635.18000000</valUSD>
        <pctVal>0.087800899597</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2046-07-01</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>California Municipal Finance Authority</name>
        <lei>5493000UQOV6R4ZWS346</lei>
        <title>California Municipal Finance Authority</title>
        <cusip>13049YCT6</cusip>
        <identifiers>
          <isin value="US13049YCT64"/>
        </identifiers>
        <balance>660000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>676209.47000000</valUSD>
        <pctVal>0.527115948877</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2051-05-15</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>County of Frederick MD</name>
        <lei>N/A</lei>
        <title>County of Frederick</title>
        <cusip>355612AE2</cusip>
        <identifiers>
          <isin value="US355612AE28"/>
        </identifiers>
        <balance>250000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>233179.83000000</valUSD>
        <pctVal>0.181767355830</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>Y</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2043-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.62500000</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>649519DA0</cusip>
        <identifiers>
          <isin value="US649519DA03"/>
        </identifiers>
        <balance>240000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>217737.36000000</valUSD>
        <pctVal>0.169729706865</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>Y</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2044-11-15</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>Commonwealth of Puerto Rico</name>
        <lei>549300X44HXPLJU48U63</lei>
        <title>Commonwealth of Puerto Rico</title>
        <cusip>74514L3Q8</cusip>
        <identifiers>
          <isin value="US74514L3Q89"/>
        </identifiers>
        <balance>13849.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>12835.56000000</valUSD>
        <pctVal>0.010005521497</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2024-07-01</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>
      <invstOrSec>
        <name>Maryland Stadium Authority Built to Learn Revenue</name>
        <lei>N/A</lei>
        <title>Maryland Stadium Authority Built to Learn</title>
        <cusip>574294AV6</cusip>
        <identifiers>
          <isin value="US574294AV69"/>
        </identifiers>
        <balance>1405000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1296493.68000000</valUSD>
        <pctVal>1.010637275379</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2046-06-01</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>Commonwealth of Puerto Rico</name>
        <lei>549300X44HXPLJU48U63</lei>
        <title>Commonwealth of Puerto Rico</title>
        <cusip>74514L3J4</cusip>
        <identifiers>
          <isin value="US74514L3J47"/>
        </identifiers>
        <balance>121739.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>125874.25000000</valUSD>
        <pctVal>0.098120963505</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.75000000</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>2023-01-30</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>
