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      <seriesName>MFS Maryland Municipal Bond Fund</seriesName>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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        <name>Maryland Economic Development Corp.</name>
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        <name>Washington Metropolitan Area Transit Authority</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Howard County Housing Commission</name>
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        <name>Maryland Community Development Administration</name>
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        <name>County of Howard MD</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>N/A</name>
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        <name>Buckeye Tobacco Settlement Financing Authority</name>
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        <name>Maryland Economic Development Corp.</name>
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        <name>Puerto Rico Electric Power Authority</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Maryland Stadium Authority</name>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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        <name>Railsplitter Tobacco Settlement Authority</name>
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          <maturityDt>2028-06-01</maturityDt>
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          <annualizedRt>6.00000000</annualizedRt>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QR203"/>
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          <maturityDt>2027-07-01</maturityDt>
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        <name>County of Howard MD</name>
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        <name>Puerto Rico Public Buildings Authority</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Electric Power Authority</name>
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        <name>Maryland Community Development Administration</name>
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        <name>Board of Governors of Colorado State University System</name>
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        <name>Maryland Community Development Administration</name>
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        <name>Maryland Economic Development Corp.</name>
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        <name>Central Plains Energy Project</name>
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        <name>County of Baltimore MD</name>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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      </invstOrSec>
      <invstOrSec>
        <name>Virginia College Building Authority</name>
        <lei>N/A</lei>
        <title>Virginia College Building Authority</title>
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          <isin value="US9277817L27"/>
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        <curCd>USD</curCd>
        <valUSD>109991.20000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2035-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <isPaidKind>N</isPaidKind>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>District of Columbia</name>
        <lei>549300HWFOZXPKGOX654</lei>
        <title>District of Columbia</title>
        <cusip>25483VUV4</cusip>
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          <isin value="US25483VUV43"/>
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        <balance>250000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>246037.50000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2039-06-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Colorado Health Facilities Authority</name>
        <lei>5493002JB6DRFRZPEQ21</lei>
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          <isin value="US19648FKA11"/>
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        <curCd>USD</curCd>
        <valUSD>54847.10000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2044-08-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>4.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
        <lei>N/A</lei>
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          <isin value="US574218P801"/>
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        <balance>400000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>478268.00000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2033-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Tennessee Energy Acquisition Corp.</name>
        <lei>549300OJ2Z8PGEY46K92</lei>
        <title>Tennessee Energy Acquisition Corp.</title>
        <cusip>880443BQ8</cusip>
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          <isin value="US880443BQ82"/>
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        <balance>140000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>149690.80000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2023-09-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
        <lei>N/A</lei>
        <title>Maryland Health &amp; Higher Educational Facilities Authority</title>
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          <isin value="US574218HH97"/>
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        <curCd>USD</curCd>
        <valUSD>1083990.00000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2037-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
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      <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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        <balance>55000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>56843.05000000</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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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Montgomery County Revenue Authority</name>
        <lei>549300JQFJ2YGGW7AW57</lei>
        <title>Montgomery County Revenue Authority</title>
        <cusip>61336RBV8</cusip>
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          <isin value="US61336RBV87"/>
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        <balance>750000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>870637.50000000</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>2036-11-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Iowa Student Loan Liquidity Corp.</name>
        <lei>549300FO1LWVSZKGJK70</lei>
        <title>Iowa Student Loan Liquidity Corp</title>
        <cusip>462590MS6</cusip>
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          <isin value="US462590MS69"/>
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        <balance>45000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>44316.45000000</valUSD>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2039-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>3.00000000</annualizedRt>
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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>County of Frederick MD</name>
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          <isin value="US35571LBE74"/>
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        <curCd>USD</curCd>
        <valUSD>1512270.00000000</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>2040-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Chattanooga Health Educational &amp; Housing Facility Board</name>
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          <isin value="US162410FE92"/>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2044-08-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Regional Transportation District</name>
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          <isin value="US759151AA14"/>
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        <debtSec>
          <maturityDt>2041-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>6.00000000</annualizedRt>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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          <isin value="US745190ZP69"/>
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        <balance>200000.00000000</balance>
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        <curCd>USD</curCd>
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        <invCountry>PR</invCountry>

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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2032-07-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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        <name>Montgomery County Housing Opportunites Commission</name>
        <lei>549300HDL0LLRHMDL092</lei>
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          <isin value="US61334MVE73"/>
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          <maturityDt>2037-07-01</maturityDt>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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        <invCountry>PR</invCountry>

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        <debtSec>
          <maturityDt>2020-07-01</maturityDt>
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          <annualizedRt>5.50000000</annualizedRt>
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        <name>Delaware Valley Regional Finance Authority</name>
        <lei>549300HGYP3NW885TT18</lei>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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          <maturityDt>2037-06-01</maturityDt>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
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        <balance>3000.00000000</balance>
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        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2024-07-01</maturityDt>
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      <invstOrSec>
        <name>Tennessee Energy Acquisition Corp.</name>
        <lei>549300OJ2Z8PGEY46K92</lei>
        <title>Tennessee Energy Acquisition Corp.</title>
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        <curCd>USD</curCd>
        <valUSD>105158.00000000</valUSD>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2022-09-01</maturityDt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Mississippi Development Bank</name>
        <lei>549300122LOI8CB50V38</lei>
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        <curCd>USD</curCd>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2040-12-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>6.87500000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>County of Prince George's MD</name>
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          <isin value="US74172RAG20"/>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2034-07-01</maturityDt>
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          <annualizedRt>5.20000000</annualizedRt>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QT514"/>
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        <curCd>USD</curCd>
        <valUSD>7100.00000000</valUSD>
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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>2030-07-01</maturityDt>
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          <annualizedRt>5.25000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Sales Tax Securitization Corp.</name>
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          <isin value="US79467BCY92"/>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2038-01-01</maturityDt>
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          <annualizedRt>4.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Pennsylvania Housing Finance Agency</name>
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          <isin value="US7087968E02"/>
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        <curCd>USD</curCd>
        <valUSD>573205.60000000</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>2037-10-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>3.70000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Tennessee Energy Acquisition Corp.</name>
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          <isin value="US880443BN51"/>
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        <curCd>USD</curCd>
        <valUSD>201070.35000000</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>2021-09-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp.</name>
        <lei>N/A</lei>
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          <isin value="US74529JQC26"/>
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        <balance>36000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>27411.12000000</valUSD>
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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>
          <annualizedRt>0.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Reading School District</name>
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          <isin value="US755638ZF37"/>
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        <balance>20000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>23714.80000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2036-03-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Guam Government Waterworks Authority</name>
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        <curCd>USD</curCd>
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        <assetCat>DBT</assetCat>
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        <invCountry>GU</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2046-01-01</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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        <fairValLevel>2</fairValLevel>
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        <name>County of Baltimore MD</name>
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          <maturityDt>2037-03-01</maturityDt>
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          <annualizedRt>4.00000000</annualizedRt>
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        <name>Michigan Finance Authority</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <name>County of Frederick MD</name>
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        <name>Chattanooga Health Educational &amp; Housing Facility Board</name>
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        <name>Puerto Rico Industrial Tourist Educational Medical &amp; Environmental Control Facilities Financing Authority</name>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
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        <isRestrictedSec>N</isRestrictedSec>

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          <maturityDt>2021-07-01</maturityDt>
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      <invstOrSec>
        <name>Maryland Economic Development Corp.</name>
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        <name>Sales Tax Securitization Corp.</name>
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        <name>Buckeye Tobacco Settlement Financing Authority</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Puerto Rico Electric Power Authority</name>
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      <invstOrSec>
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          <isin value="US13049YCT64"/>
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        <curCd>USD</curCd>
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        <fairValLevel>2</fairValLevel>
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      <invstOrSec>
        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
        <lei>N/A</lei>
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          <isin value="US5742182P76"/>
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        <curCd>USD</curCd>
        <valUSD>866910.00000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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      <invstOrSec>
        <name>City of Baltimore MD</name>
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          <isin value="US059231UK41"/>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
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          <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>New Jersey Economic Development Authority</name>
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          <isin value="US64577B7P37"/>
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        <curCd>USD</curCd>
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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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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QT365"/>
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        <curCd>USD</curCd>
        <valUSD>176875.00000000</valUSD>
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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>2029-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Spartanburg Regional Health Services District</name>
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          <isin value="US847113CG08"/>
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        <curCd>USD</curCd>
        <valUSD>684047.40000000</valUSD>
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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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        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>Maryland Economic Development Corp.</name>
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        <title>Maryland Economic Development Corp.</title>
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          <isin value="US574205GQ76"/>
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        <balance>750000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>750532.50000000</valUSD>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-12-01</maturityDt>
          <couponKind>Variable</couponKind>
          <annualizedRt>2.54999900</annualizedRt>
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          <isCashCollateral>N</isCashCollateral>
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      <invstOrSec>
        <name>City of Brunswick MD</name>
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          <isin value="US117250AE03"/>
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        <balance>500000.00000000</balance>
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        <curCd>USD</curCd>
        <valUSD>505970.00000000</valUSD>
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        <assetCat>DBT</assetCat>
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        <invCountry>US</invCountry>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2036-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Washington Metropolitan Area Transit Authority</name>
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          <isin value="US938782FT15"/>
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        <curCd>USD</curCd>
        <valUSD>1325318.40000000</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>2042-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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      <invstOrSec>
        <name>Puerto Rico Sales Tax Financing Corp.</name>
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          <isin value="US74529JRH04"/>
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        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
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          <maturityDt>2040-07-01</maturityDt>
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          <annualizedRt>4.32900000</annualizedRt>
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        <name>Puerto Rico Electric Power Authority</name>
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          <isin value="US74526QX490"/>
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        <fairValLevel>2</fairValLevel>
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          <maturityDt>2018-07-01</maturityDt>
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          <annualizedRt>5.00000000</annualizedRt>
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        <name>Puerto Rico Convention Center District Authority</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <invCountry>US</invCountry>
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          <maturityDt>2049-10-01</maturityDt>
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        <name>Puerto Rico Sales Tax Financing Corp.</name>
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          <isin value="US74529JQG30"/>
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        <invCountry>PR</invCountry>

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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2046-07-01</maturityDt>
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        <name>Guam Government Waterworks Authority</name>
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        <name>Puerto Rico Highway &amp; Transportation Authority</name>
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        <name>Maryland Health &amp; Higher Educational Facilities Authority</name>
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        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2035-10-01</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>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>74527JAD9</cusip>
        <identifiers>
          <isin value="US74527JAD90"/>
        </identifiers>
        <balance>245000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>251125.00000000</valUSD>
        <pctVal>0.237323187094</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2022-06-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>9.12000000</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 Highway &amp; Transportation Authority</name>
        <lei>549300J6QBXVWJXB7Y41</lei>
        <title>Puerto Rico Highway &amp; Transportation Authority</title>
        <cusip>745190UP1</cusip>
        <identifiers>
          <isin value="US745190UP15"/>
        </identifiers>
        <balance>170000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>170457.30000000</valUSD>
        <pctVal>0.161088978395</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2035-07-01</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>Puerto Rico Electric Power Authority</name>
        <lei>5493003BRB67HF8ST418</lei>
        <title>Puerto Rico Electric Power Authority</title>
        <cusip>74526QR95</cusip>
        <identifiers>
          <isin value="US74526QR955"/>
        </identifiers>
        <balance>95000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>67450.00000000</valUSD>
        <pctVal>0.063742952591</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>PR</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2027-07-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>5.25000000</annualizedRt>
          <isDefault>Y</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCU7</cusip>
        <identifiers>
          <isin value="US79467BCU70"/>
        </identifiers>
        <balance>100000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>116643.00000000</valUSD>
        <pctVal>0.110232308659</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-01-01</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>Travis County Health Facilities Development Corp.</name>
        <lei>N/A</lei>
        <title>Travis County Health Facilities Development Corp.</title>
        <cusip>89438LCK2</cusip>
        <identifiers>
          <isin value="US89438LCK26"/>
        </identifiers>
        <balance>45000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>46483.20000000</valUSD>
        <pctVal>0.043928486492</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2030-11-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>7.00000000</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>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCR4</cusip>
        <identifiers>
          <isin value="US79467BCR42"/>
        </identifiers>
        <balance>40000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>44721.20000000</valUSD>
        <pctVal>0.042263325892</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2026-01-01</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>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>
        <identifiers>
          <isin value="US745272EZ30"/>
        </identifiers>
        <balance>30000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>26638.50000000</valUSD>
        <pctVal>0.025174449853</pctVal>
        <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>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Tennessee Energy Acquisition Corp.</name>
        <lei>549300OJ2Z8PGEY46K92</lei>
        <title>Tennessee Energy Acquisition Corp.</title>
        <cusip>880443DZ6</cusip>
        <identifiers>
          <isin value="US880443DZ63"/>
        </identifiers>
        <balance>235000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>239324.00000000</valUSD>
        <pctVal>0.226170769250</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2021-02-01</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>Maryland Economic Development Corp.</name>
        <lei>549300JJ16DDBSZWSN94</lei>
        <title>Maryland Economic Development Corp.</title>
        <cusip>57420MAT0</cusip>
        <identifiers>
          <isin value="US57420MAT09"/>
        </identifiers>
        <balance>600000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>612282.00000000</valUSD>
        <pctVal>0.578631022958</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2044-07-01</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>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCS2</cusip>
        <identifiers>
          <isin value="US79467BCS25"/>
        </identifiers>
        <balance>90000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>102188.70000000</valUSD>
        <pctVal>0.096572416003</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2027-01-01</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>Sales Tax Securitization Corp.</name>
        <lei>N/A</lei>
        <title>Sales Tax Securitization Corp.</title>
        <cusip>79467BCV5</cusip>
        <identifiers>
          <isin value="US79467BCV53"/>
        </identifiers>
        <balance>40000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>47202.80000000</valUSD>
        <pctVal>0.044608537325</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2030-01-01</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>Maryland Economic Development Corp.</name>
        <lei>549300JJ16DDBSZWSN94</lei>
        <title>Maryland Economic Development Corp.</title>
        <cusip>57420NAW1</cusip>
        <identifiers>
          <isin value="US57420NAW11"/>
        </identifiers>
        <balance>520000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>520743.60000000</valUSD>
        <pctVal>0.492123567191</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-04-01</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>Travis County Health Facilities Development Corp.</name>
        <lei>N/A</lei>
        <title>Travis County Health Facilities Development Corp.</title>
        <cusip>89438LCB2</cusip>
        <identifiers>
          <isin value="US89438LCB27"/>
        </identifiers>
        <balance>85000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>87863.65000000</valUSD>
        <pctVal>0.083034669776</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2040-11-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>7.12500000</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 Howard MD</name>
        <lei>N/A</lei>
        <title>County of Howard</title>
        <cusip>442566FV2</cusip>
        <identifiers>
          <isin value="US442566FV24"/>
        </identifiers>
        <balance>450000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>477409.50000000</valUSD>
        <pctVal>0.451171106377</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2021-02-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>8.15000000</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 Prince George's MD</name>
        <lei>549300NSQ1W50I0VU811</lei>
        <title>County of Prince George's</title>
        <cusip>741705HH3</cusip>
        <identifiers>
          <isin value="US741705HH35"/>
        </identifiers>
        <balance>1000000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1239860.00000000</valUSD>
        <pctVal>1.171717378797</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2037-10-01</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>County of Washington MD</name>
        <lei>N/A</lei>
        <title>County of Washington</title>
        <cusip>937752AR4</cusip>
        <identifiers>
          <isin value="US937752AR44"/>
        </identifiers>
        <balance>575000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>648904.75000000</valUSD>
        <pctVal>0.613240989111</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>MUN</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-01-01</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>2020-04-30</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>
</edgarSubmission>
