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      <Form990PartVIISectionAGrp>
        <PersonNm>FRANK BAILEY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRACKETT DENNISTON</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BRIAN BRODERICK</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ANDREW DAVIS</PersonNm>
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        <PersonNm>GARY CAMPBELL</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>C BRUCE JOHNSTONE</PersonNm>
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        <PersonNm>MARK RICKABAUGH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>FREDERICK CLIFFORD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ADAM PORTNOY</PersonNm>
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        <PersonNm>MARY MYERS KAUPPILA</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>M HOLT MASSEY</PersonNm>
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        <PersonNm>PAMELA LAYTON</PersonNm>
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      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
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        <ExclusionAmt>0</ExclusionAmt>
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      <RoyaltiesRevenueGrp>
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      <GrossRentsGrp>
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        <PersonalAmt>0</PersonalAmt>
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      <LessRentalExpensesGrp>
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        <PersonalAmt>0</PersonalAmt>
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      <RentalIncomeOrLossGrp>
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        <PersonalAmt>0</PersonalAmt>
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      <NetRentalIncomeOrLossGrp>
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        <RelatedOrExemptFuncIncomeAmt>0</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <GrossAmountSalesAssetsGrp>
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        <OtherAmt>0</OtherAmt>
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      <NetGainOrLossInvestmentsGrp>
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      <ContriRptFundraisingEventAmt>0</ContriRptFundraisingEventAmt>
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      <NetIncmFromFundraisingEvtGrp>
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      <NetIncomeFromGamingGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <OtherRevenueMiscGrp>
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      <OtherRevenueMiscGrp>
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      <FeesForServicesLobbyingGrp>
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        <FundraisingAmt>0</FundraisingAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <FundraisingAmt>6018</FundraisingAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>23535</ProgramServicesAmt>
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        <FundraisingAmt>10905</FundraisingAmt>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>Part II - Line 10</FormAndLineReferenceDesc>
        <ExplanationTxt>| Year:, Amount:, Description:| 2019, 19196, SALE OF PUBLICATIONS &amp; EVENT TICKET SALES| 2020, 6675SALE OF PUBLICATIONS &amp; EVENT TICKET SALES| 2021, 33641SALE OF PUBLICATIONS &amp; EVENT TICKET SALES| 2022, 6885SALE OF PUBLICATIONS &amp; EVENT TICKET SALES &amp; PROCEEDS FROM SHARED SERVICES AGREEMENT| 2023, 10656SALE OF PUBLICATIONS &amp; EVENT TICKET SALES &amp; PROCEEDS FROM SHARED SERVICES AGREEMENT|</ExplanationTxt>
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          <AddressLine2>RESTRICTED</AddressLine2>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV</FormAndLineReferenceDesc>
        <ExplanationTxt>| PartandLinenumber:,Explanation:| Part II-A Line 1,PIONEER INSTITUTE DID NOT INCUR ANY LOBBYING OR POLITICAL ACTIVITY RELATED EXPENSES DURING THE FISCAL YEAR. HOWEVER THE ORGANIZATION PREVIOUSLY ADOPTED A SECTION h ELECTION BY FILING FORM 5768 WHICH IS AN ONGOING ELECTION. THEREFORE IN PART IV OF FORM 990 WAS CHECKED YES.|</ExplanationTxt>
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        <PersonNm>JAMES STERGIOS</PersonNm>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <PersonNm>JAMIE GASS</PersonNm>
        <TitleTxt>Director of PioneerEducation</TitleTxt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MARY Z CONAUGHTON</PersonNm>
        <TitleTxt>Chief Operating Officer</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>38174</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>268168</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>WILLIAM SMITH</PersonNm>
        <TitleTxt>Director Life Sciences</TitleTxt>
        <BaseCompensationFilingOrgAmt>209983</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>7887</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>217870</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>FRANK BAILEY</PersonNm>
        <TitleTxt>President of PioneerLegal</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>4500</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>154500</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>Part I Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR's ANNUAL COMPENSATION IS SUBJECT TO THE RECOMMENDATION OF THE STRATEGIC IMPLEMENTATION COMMITTEE ESTABLISHED BY THE BOARD, WHICH IS SUBJECT TO THE FINAL APPROVAL OF THE ENTIRE BOARD. THE COMMITTEE CONDUCTS AN ANNUAL PERFORMANCE EVALUATION RELATIVE TO CERTAIN GOALS AND KEY PERFORMANCE METRICS WHILE ALSO CONDUCTING A MARKET STUDY OF COMPENSATION DATA FOR COMPARABLE ORGANIZATIONS. DOCUMENTATION OF THE PROCESS AND THE RESULTS ARE RECORDED IN THE MINUTES OF THE COMMITTEE AND BOARD MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
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      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>4</ContributionCnt>
        <NoncashContributionsRptF990Amt>218862</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>AUDIT and TAX SERVICES</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>20000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>SOCIAL MEDIA ADVERTISING CREDITS</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>88121</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>PUBLIC RELATIONS</Desc>
        <ContributionCnt>4</ContributionCnt>
        <NoncashContributionsRptF990Amt>30000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>FUND RAISING EVENT</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>21641</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FAIR MARKET VALUE</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
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    <IRS990ScheduleO documentId="IRS990ScheduleO1" documentName="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCEDURES THAT PIONEER FOLLOWS IN THE REVIEW OF ITS FORM 990 INCLUDES THE FOLLOWING: 1 FORM 990 IS COMPLETED BY PIONEER's AUDITORS WITH ASSISTANCE FROM MANAGEMENT 2 THE RETURN IS REVIEWED BY MANAGEMENT AND ANY REVISIONS COMPLETED 3 THE FORM IS SCRUTINZED BY PIONEER's AUDIT COMMITTEE AND ANY QUESTIONS ADDRESSED BY MANAGEMENT and or THE AUDITOR 4 THE FINAL VERSION OF THE FORM 990 IS DISTRIBUTED TO MANAGEMENT THE AUDIT COMMITTEE AND BOARD of DIRECTORS PRIOR TO FILING WITH THE AUTHORITIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>PIONEER's CONFLICT OF INTEREST POLICY IS CIRCULATED TO THE ORGANIZATION's EMPLOYEES MANAGEMENT and the BOARD OF DIRECTORS ANNUALLY INCLUDING MANGAGEMENT AND THE BOARD OF DIRECTORS. RECIPIENTS ARE REQUIRED TO SIGN THE POLICY AND DISCLOSE AND POTENTIAL CONFLICTS. ADDITIONALLY MANAGEMENT REGULARLY MONITORS VENDOR RELATIONSHIPS FOR ANY POTENTIAL CONFLICTS THROUGHOUT THE YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>| Description:, Expense Amount:, Grants Amount:, Revenue Amount:| PIONEER LEGAL is a nonpartisan public interest law organization whose purpose is to undertake legal &amp; educational efforts including litigation and policy advocacy to enable people to prosper and society to thrive in connection with defending and promoting excellence in educational outcomes transparent and accountable government humane and economically beneficial immigration policies inclusive &amp; effective transportation systems and generally promoting economic opportunity across New England., $424874, $0, $463275| PIONEERPUBLIC promotes MBTA &amp; governmental pension reforms that provide fair and sustainable retirement support full transparency of public information and performance measurement and the adoption of best practices in state &amp; local government with a current focus on local governments and the state's transportation bureaucracy and competitive contracting of public services when the quality of the service can be improved and the cost lowered. Using online transparency and data analysis tools. Pioneer has given citizens access to public data through various data tools under the name of MassWatch on its website., $139493, $0, $100| LOVETT PETERS LECTURE SERIES was named in honor of Pioneeer's founding Chairman a successful business executive entrepreneur philanthropist and lifelong proponent of high quality education opportunities for children. The event assembles Pioneer's closest supporters to encourage and honor individuals whose vision thought leadership and accomplishments have left a mark on the world., $92270, $0, $234000| PIONEER PUBLIC OUTREACH includes all communication activities related to sharing our research and programs with the public., $487959, $0, $0|</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| THE COMPENSATION OF PIONEER's OFFICERS and KEY EMPLOYEES IS DETERMINED IN ACCORDANCE WITH THE FOLLOWING PROCEDURES: 1 SELF-EVALUATION OF THE EIMPLOYEE IS UNDERTAKEN AND SHARED WITH MANAGEMENT 2 AN ANNUAL PERFORMANCE EVALUATION IS UNDERTAKEN BY THE EMPLOYEE'S SUPERVISOR OR IN THE CASE OF THE EXECUTIVE DIRECTOR BY THE BOARD AND THE STRATEGIC IMPLEMENTATION COMMITTEE AT WHICH POINT THEIR PERFORMANCE IS EVALUATED RELATIVE TO CERTAIN GOALS OR KEY PERFORMANCE METRICS 3 A REVIEW OF COMPARATIVE COMPENSATION FOR SIMLAR ORGANIZATIONS IN TERMS OF SIZE REVENUE NUMBER of EMPLOYEES &amp; GEOGRAPHICAL MARKET IS UNDERTAKEN AND 4 DOCUEMENTATION OF THE PROCEDURES AND RESULTS ARE RECORDED IN THE EMPLOYEE'S PERSONNEL FILE. THE ANNUAL COMPENSATION FOR THE EXECUTIVE DIRECTOR IS SUBJECT TO THE RECOMMENDATION OF THE STREGIC IMPLEMENTATION COMMTTEE ESTABLISHED BY THE BOARD WHICH IS SUBJECT TO THE APPROVAL OF THE ENTIRE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part VI Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| PIONEER MAKES THEIR AUDITED FINANCIAL STATEMENTS AND TAX RETURNS FOR THE LAST 10-YEARS ACCESSIBLE FROM ITS WEBSITE. ADDITIONALLY THE FINANCIAL STATEMENTS AND TAX RETURNS ARE AVAILABLE UPON REQUEST ALONG WITH THE ORGANIZATION's BYLAWS AND CONFLICT OF INTEREST POLICY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part III General</FormAndLineReferenceDesc>
        <ExplanationTxt>| Explanation:| PIONEER's SUBORDINATES INCLUDE PIONEER LEGAL LLC A MASSACHUSETTS SINGLE MEMBER LIMITED LIABILITY COMPANY WITH AN ADDRESS OF 185 DEVONSHIRE STREET SUITE 1101 BOSTON MA 02110.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <BusinessNameLine1Txt>PIONEERLEGAL LLC</BusinessNameLine1Txt>
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          <AddressLine1Txt>185 DEVONSHIRE STREET</AddressLine1Txt>
          <AddressLine2Txt>SUITE 1101</AddressLine2Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02110</ZIPCd>
        </USAddress>
        <EIN>874300907</EIN>
        <PrimaryActivitiesTxt>PUBLIC INTEREST LAW</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <TotalIncomeAmt>-56221</TotalIncomeAmt>
        <EndOfYearAssetsAmt>259564</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>PIONEER INSTITUTE INC</BusinessNameLine1Txt>
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</Return>