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      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
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      <ProgramServiceRevenueGrp>
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        <ExclusionAmt>40571</ExclusionAmt>
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        <ProgramServicesAmt>538366</ProgramServicesAmt>
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      <FeesForServicesLegalGrp>
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        <ManagementAndGeneralAmt>97</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>19985</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>260811</ProgramServicesAmt>
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        <ProgramServicesAmt>16044</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36487</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>30</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1700</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>2920</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23229</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>410456</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3986</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>3272</ManagementAndGeneralAmt>
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        <Desc>DUES AND SUBSCRIPTIONS</Desc>
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        <ProgramServicesAmt>1235340</ProgramServicesAmt>
        <ManagementAndGeneralAmt>437480</ManagementAndGeneralAmt>
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        <EOYAmt>778138</EOYAmt>
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        <EOYAmt>975421</EOYAmt>
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        <EOYAmt>69550</EOYAmt>
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        <EOYAmt>128564</EOYAmt>
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      <OrgDoesNotFollowFASB117Ind>X</OrgDoesNotFollowFASB117Ind>
      <CapStkTrPrinCurrentFundsGrp>
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        <EOYAmt>0</EOYAmt>
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      <PdInCapSrplsLandBldgEqpFundGrp>
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        <EOYAmt>0</EOYAmt>
      </PdInCapSrplsLandBldgEqpFundGrp>
      <RtnEarnEndowmentIncmOthFndsGrp>
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        <EOYAmt>846857</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
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        <EOYAmt>846857</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>1049907</BOYAmt>
        <EOYAmt>975421</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-130889</ReconcilationRevenueExpnssAmt>
      <PriorPeriodAdjustmentsAmt>-8</PriorPeriodAdjustmentsAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus3YearsAmt>43450</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>37000</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>31205</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>45000</CurrentTaxYearAmt>
        <TotalAmt>156655</TotalAmt>
      </GiftsGrantsContrisRcvd509Grp>
      <GrossReceiptsAdmissionsGrp>
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        <CurrentTaxYearMinus3YearsAmt>457473</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>868080</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1813100</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1456360</CurrentTaxYearAmt>
        <TotalAmt>4947159</TotalAmt>
      </GrossReceiptsAdmissionsGrp>
      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>352146</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>500923</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>905080</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1844305</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1501360</CurrentTaxYearAmt>
        <TotalAmt>5103814</TotalAmt>
      </Total509Grp>
      <AmountsRcvdDsqlfyPersonGrp>
        <CurrentTaxYearMinus3YearsAmt>35000</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>25500</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>30000</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>45000</CurrentTaxYearAmt>
        <TotalAmt>135500</TotalAmt>
      </AmountsRcvdDsqlfyPersonGrp>
      <SubstantialContributorsAmtGrp>
        <CurrentTaxYearMinus1YearAmt>120061</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>155148</CurrentTaxYearAmt>
        <TotalAmt>275209</TotalAmt>
      </SubstantialContributorsAmtGrp>
      <SubstAndDsqlfyPrsnsTotGrp>
        <CurrentTaxYearMinus3YearsAmt>35000</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>25500</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>150061</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>200148</CurrentTaxYearAmt>
        <TotalAmt>410709</TotalAmt>
      </SubstAndDsqlfyPrsnsTotGrp>
      <PublicSupportTotal509Amt>4693105</PublicSupportTotal509Amt>
      <GrossInvestmentIncome509Grp>
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        <CurrentTaxYearMinus3YearsAmt>10</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>10</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>12577</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>40571</CurrentTaxYearAmt>
        <TotalAmt>53195</TotalAmt>
      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>27</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>10</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>10</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>12577</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>40571</CurrentTaxYearAmt>
        <TotalAmt>53195</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>352173</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>500933</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>905090</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1856882</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1541931</CurrentTaxYearAmt>
        <TotalAmt>5157009</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.91000</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.95070</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.01030</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.00300</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART III</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 2022 COLUMN IS FOR THE SHORT YEAR 4/1/22-12/31/22.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>CASH EQUIVALENTS HELD BY INVESTMENT MANAGERS</Desc>
        <BookValueAmt>778138</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>778138</TotalBookValueSecuritiesAmt>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>I2SL DELEGATED CONTROL OVER MANAGEMENT DUTIES TO EASTERN RESEARCH GROUP. AS PART OF THIS ARRANGEMENT, I2SL'S EXECUTIVE DIRECTOR WAS COMPENSATED $89,958 BY EASTERN RESEARCH GROUP IN 2024 FOR MANAGEMENT SERVICES TO I2SL. ALSO, AS PART OF THIS ARRANGEMENT, I2SL'S SECRETARY WAS COMPENSATED $221,255 BY EASTERN RESEARCH GROUP IN 2024 AS AN INDIVIDUAL CONSULTANT TO SUPPORT I2SL ACTIVITIES (NOT FOR SERVICES AS BOARD SECRETARY). I2SL COMPENSATED EASTERN RESEARCH GROUP FOR HER TIME.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERSHIP IN I2SL IS OPEN TO INDIVIDUAL PROFESSIONALS FOR A FEE DETERMINED BY THE BOARD OF DIRECTORS. MEMBERS MAY RECEIVE DISCOUNTS TO TRAINING EVENTS, BUT HAVE NO SPECIFIC RIGHTS OR RESPONSIBILITIES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS REVIEWED BY THE PRESIDENT AND THE BOARD OF DIRECTORS BEFORE IT IS FILED. ADDITIONALLY, A COPY IS POSTED TO A RESTRICTED AREA OF THE I2SL WEBSITE FOR VIEWING BY THE BOARD OF DIRECTORS AT THEIR CONVENIENCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS OF THE BOARD OF DIRECTORS SIGN A STATEMENT ANNUALLY CERTIFYING THAT THEY HAVE: (A) RECEIVED A COPY OF THE CONFLICT OF INTEREST POLICY, (B) READ AND UNDERSTAND THE POLICY, (C) AGREE TO COMPLY WITH THE POLICY, AND (D)UNDERSTAND THE CHARITABLE MISSION OF I2SL AND THAT IN ORDER TO MAINTAIN ITS FEDERAL TAX EXEMPTION, IT MUST ENGAGE PRIMARILY IN ACTIVITIES WHICH ACCOMPLISH ONE OR MORE OF ITS TAX-EXEMPT PURPOSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROFESSIONAL FEES: PROGRAM SERVICE EXPENSES 56,811. MANAGEMENT AND GENERAL EXPENSES 0. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 56,811. SOFTWARE PROGRAM DEVELOPMENT FEES: PROGRAM SERVICE EXPENSES 204,000. MANAGEMENT AND GENERAL EXPENSES 36,800. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 240,800.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>