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        <BusinessCd>541900</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>40</RelatedOrExemptFuncIncomeAmt>
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        <ExclusionAmt>20947</ExclusionAmt>
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        <SecuritiesAmt>43081</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
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        <ExclusionAmt>19058</ExclusionAmt>
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        <TotalRevenueColumnAmt>244488</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>204483</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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        <ProgramServicesAmt>322</ProgramServicesAmt>
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        <ProgramServicesAmt>51893</ProgramServicesAmt>
        <ManagementAndGeneralAmt>112435</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
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        <ManagementAndGeneralAmt>9375</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>2077</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>2972</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7192</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>DUES &amp; SUBSCRIPTIONS</Desc>
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        <ManagementAndGeneralAmt>250</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>388352</ProgramServicesAmt>
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        <EOYAmt>102512</EOYAmt>
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        <EOYAmt>823926</EOYAmt>
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        <EOYAmt>300967</EOYAmt>
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        <BOYAmt>-1355543</BOYAmt>
        <EOYAmt>-1615809</EOYAmt>
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        <BOYAmt>971150</BOYAmt>
        <EOYAmt>1016719</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>-320764</ReconcilationRevenueExpnssAmt>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PubliclySupportedOrg509a2Ind>X</PubliclySupportedOrg509a2Ind>
      <GiftsGrantsContrisRcvd509Grp>
        <CurrentTaxYearMinus4YearsAmt>5000</CurrentTaxYearMinus4YearsAmt>
        <TotalAmt>5000</TotalAmt>
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      <GrossReceiptsAdmissionsGrp>
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        <CurrentTaxYearMinus3YearsAmt>107750</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>115520</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>187060</CurrentTaxYearMinus1YearAmt>
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      <Total509Grp>
        <CurrentTaxYearMinus4YearsAmt>200960</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>107750</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>115520</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>187060</CurrentTaxYearMinus1YearAmt>
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        <CurrentTaxYearMinus4YearsAmt>8005</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>4050</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4050</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>12100</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1025</CurrentTaxYearAmt>
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      <SubstantialContributorsAmtGrp>
        <TotalAmt>0</TotalAmt>
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      <SubstAndDsqlfyPrsnsTotGrp>
        <CurrentTaxYearMinus4YearsAmt>8005</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>4050</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4050</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>12100</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1025</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>18172</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>20947</CurrentTaxYearAmt>
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      </GrossInvestmentIncome509Grp>
      <InvestmentIncomeAndUBTIGrp>
        <CurrentTaxYearMinus4YearsAmt>18538</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>15754</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>19094</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>18172</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>20947</CurrentTaxYearAmt>
        <TotalAmt>92505</TotalAmt>
      </InvestmentIncomeAndUBTIGrp>
      <TotalSupportCalendarYearGrp>
        <CurrentTaxYearMinus4YearsAmt>219498</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>123504</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>134614</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>205232</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>225430</CurrentTaxYearAmt>
        <TotalAmt>908278</TotalAmt>
      </TotalSupportCalendarYearGrp>
      <PublicSupportCY509Pct>0.86600</PublicSupportCY509Pct>
      <PublicSupportPY509Pct>0.85970</PublicSupportPY509Pct>
      <InvestmentIncomeCYPct>0.10180</InvestmentIncomeCYPct>
      <InvestmentIncomePYPct>0.09790</InvestmentIncomePYPct>
      <ThirtyThrPctSuprtTestsCY509Ind>X</ThirtyThrPctSuprtTestsCY509Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <CYEndwmtFundGrp>
        <BeginningYearBalanceAmt>571502</BeginningYearBalanceAmt>
        <ContributionsAmt>1430</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>96274</InvestmentEarningsOrLossesAmt>
        <AdministrativeExpensesAmt>4482</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>664724</EndYearBalanceAmt>
      </CYEndwmtFundGrp>
      <CYMinus1YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>695872</BeginningYearBalanceAmt>
        <ContributionsAmt>1430</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>-121325</InvestmentEarningsOrLossesAmt>
        <AdministrativeExpensesAmt>4475</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>571502</EndYearBalanceAmt>
      </CYMinus1YrEndwmtFundGrp>
      <CYMinus2YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>627756</BeginningYearBalanceAmt>
        <ContributionsAmt>1560</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>69142</InvestmentEarningsOrLossesAmt>
        <AdministrativeExpensesAmt>2586</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>695872</EndYearBalanceAmt>
      </CYMinus2YrEndwmtFundGrp>
      <CYMinus3YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>548474</BeginningYearBalanceAmt>
        <ContributionsAmt>1170</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>82201</InvestmentEarningsOrLossesAmt>
        <AdministrativeExpensesAmt>4089</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>627756</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>458693</BeginningYearBalanceAmt>
        <ContributionsAmt>7600</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>94671</InvestmentEarningsOrLossesAmt>
        <AdministrativeExpensesAmt>12490</AdministrativeExpensesAmt>
        <EndYearBalanceAmt>548474</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>0.54723</BoardDesignatedBalanceEOYPct>
      <PrmnntEndowmentBalanceEOYPct>0.08500</PrmnntEndowmentBalanceEOYPct>
      <TermEndowmentBalanceEOYPct>0.36777</TermEndowmentBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>0</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <TotalBookValueLandBuildingsAmt>0</TotalBookValueLandBuildingsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>DUE TO RELATED ORGANIZATIONS</Desc>
        <Amt>2432247</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>2432247</TotalLiabilityAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EARNINGS FROM THE ORGANIZATION'S ENDOWMENT FUNDS ARE USED PRIMARILY FOR THREE PURPOSES: (I) THE HOWE MEDAL ENDOWMENT FUND IS USED TO DEFRAY THE EXPENSES OF AWARDING THE HOWE MEDAL; (II) THE VERHOEFF LECTURE ENDOWMENT FUND IS USED TO DEFRAY THE EXPENSES OF THE VERHOEFF LECTURES; AND (III) THE KENNEDY-SNELL ENDOWMENT FUND SHALL BE EMPLOYED FOR THE ADVANCEMENT OF OPHTHALMIC SCIENCE AND ART. THE BOARD-DESIGNATED ENDOWMENT FUND SHALL BE USED TO SUPPORT THE MISSION OF AOS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>AOS HAS A MANAGEMENT CONTRACT WITH SAN FRANCISCO ASSOCIATION MANAGEMENT SERVICES (SF-AMS). UNDER THE ANNUAL CONTRACT, ALL PERSONNEL DECISIONS AND FINANCIAL OPERATIONS ARE THE RESPONSIBILITY OF SF-AMS. PAYMENTS TO SF-AMS DURING THE 2023 CALENDAR YEAR TOTALED $172,977.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE AMERICAN OPHTHALMOLOGICAL SOCIETY (AOS) HAS ONE CLASS OF MEMBERS WHO, PURSUANT TO THE AOS GOVERNING DOCUMENTS, HAS THE RIGHT TO PARTICIPATE IN THE ORGANIZATION'S GOVERNANCE: ACTIVE MEMBERS. ACTIVE MEMBERS ARE GRADUATES IN MEDICINE IN GOOD PROFESSIONAL STANDING, AS EVIDENCED BY AN UNRESTRICTED LICENSE TO PRACTICE MEDICINE IN ALL JURISDICTIONS IN WHICH THEY ARE LICENSED, UNLESS THE MEMBER IS RETIRED FROM MEDICAL PRACTICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ACTIVE MEMBERSHIP IN ATTENDANCE AT THE ANNUAL MEETING VOTES AND ELECTS THE GOVERNING BODY FROM A POOL OF CANDIDATES PUT FORTH BY THE AOS COUNCIL EVERY YEAR DURING THE ANNUAL MEETING IN MAY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGES TO THE ORGANIZATION'S BYLAWS MUST BE APPROVED BY THE MEMBERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY AN OUTSIDE TAX PROFESSIONAL. THE FORM IS THEN REVIEWED BY THE FINANCE AND ACCOUNTING STAFF OF THE ORGANIZATION'S MANAGEMENT COMPANY, WITH QUESTIONS REFERRED TO THE OUTSIDE TAX PROFESSIONAL. AFTER A FULL REVIEW (WITH MODIFICATIONS WHERE NECESSARY), THE FINAL VERSION OF THE FORM 990 IS PROVIDED TO ALL MEMBERS OF THE ORGANIZATION'S VOTING GOVERNING BODY PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>AOS HAS A PROFOUND DUTY TO ITS MEMBERS, THE LARGER MEDICAL COMMUNITY, AND THE PUBLIC TO ENSURE THE INTEGRITY OF ITS SCIENTIFIC, EDUCATIONAL, AND CONSUMER INFORMATION ACTIVITIES AND MATERIALS. THUS, EACH AOS COUNCIL MEMBER AND OFFICER IS REQUIRED TO DISCLOSE AND MANAGE CONFLICT OF INTEREST OR THE APPEARANCE OF CONFLICTS OF INTEREST THAT AFFECT THIS INTEGRITY. ALL AOS LEADERS MUST DISCLOSE SIGNIFICANT FINANCIAL RELATIONSHIPS TO AOS ANNUALLY. WHERE SUCH CONFLICTS OR PERCEIVED CONFLICTS EXIST, THEY MUST BE APPROPRIATELY AND FULLY DISCLOSED AND RESOLVED. AOS HAS DETERMINED THAT A FINANCIAL RELATIONSHIP SHOULD NOT RESTRICT EXPERT SCIENTIFIC, CLINICAL, OR NON-CLINICAL CONTRIBUTIONS TO AOS'S ACTIVITIES PROVIDED THAT APPROPRIATE DISCLOSURE OF SUCH RELATIONSHIPS IS MADE. SIMILARLY, IT SHOULD NOT RESTRICT PARTICIPATION IN AOS LEADERSHIP AND GOVERNANCE, SO LONG AS APPROPRIATE DISCLOSURE IS MADE.</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>
    </IRS990ScheduleO>
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>AOS CHARITABLE EDUCATIONAL AND SCIENTIFIC FUND</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>655 BEACH STREET</AddressLine1Txt>
          <CityNm>SAN FRANCISCO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94109</ZIPCd>
        </USAddress>
        <EIN>411872794</EIN>
        <PrimaryActivitiesTxt>SUPPORT OF AOS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MN</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>AMERICAN OPHTHALMOLOGICAL SOCIETY</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>HERMAN KNAPP TESTIMONIAL FUND</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>655 BEACH STREET</AddressLine1Txt>
          <CityNm>SAN FRANCISCO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94109</ZIPCd>
        </USAddress>
        <EIN>046042338</EIN>
        <PrimaryActivitiesTxt>SUPPORT OF AOS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MD</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>AMERICAN OPHTHALMOLOGICAL SOCIETY</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>1</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>0</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>0</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>1</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>1</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>HERMAN KNAPP TESTIMONIAL FUND</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>E</TransactionTypeTxt>
        <InvolvedAmt>2202025</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>BOOK VALUE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
      <TransactionsRelatedOrgGrp>
        <OtherOrganizationName>
          <BusinessNameLine1Txt>AOS CHARITABLE EDUCATIONAL AND SCIENTIFIC FUND</BusinessNameLine1Txt>
        </OtherOrganizationName>
        <TransactionTypeTxt>E</TransactionTypeTxt>
        <InvolvedAmt>230222</InvolvedAmt>
        <MethodOfAmountDeterminationTxt>BOOK VALUE</MethodOfAmountDeterminationTxt>
      </TransactionsRelatedOrgGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>