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      <CompCurrentOfcrDirectorsGrp>
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        <FundraisingAmt>179044</FundraisingAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>109619</TotalAmt>
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        <ManagementAndGeneralAmt>29315</ManagementAndGeneralAmt>
        <FundraisingAmt>4627</FundraisingAmt>
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      <OtherEmployeeBenefitsGrp>
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        <ProgramServicesAmt>247647</ProgramServicesAmt>
        <ManagementAndGeneralAmt>21271</ManagementAndGeneralAmt>
        <FundraisingAmt>8621</FundraisingAmt>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>193591</ProgramServicesAmt>
        <ManagementAndGeneralAmt>68525</ManagementAndGeneralAmt>
        <FundraisingAmt>5695</FundraisingAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>21098</TotalAmt>
        <ManagementAndGeneralAmt>21098</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>44100</TotalAmt>
        <ManagementAndGeneralAmt>44100</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>4746</TotalAmt>
        <ManagementAndGeneralAmt>4746</ManagementAndGeneralAmt>
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        <TotalAmt>79093</TotalAmt>
        <ProgramServicesAmt>44638</ProgramServicesAmt>
        <ManagementAndGeneralAmt>30973</ManagementAndGeneralAmt>
        <FundraisingAmt>3482</FundraisingAmt>
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      <AdvertisingGrp>
        <TotalAmt>59154</TotalAmt>
        <ManagementAndGeneralAmt>48014</ManagementAndGeneralAmt>
        <FundraisingAmt>11140</FundraisingAmt>
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      <OfficeExpensesGrp>
        <TotalAmt>166074</TotalAmt>
        <ProgramServicesAmt>119323</ProgramServicesAmt>
        <ManagementAndGeneralAmt>42416</ManagementAndGeneralAmt>
        <FundraisingAmt>4335</FundraisingAmt>
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      <OccupancyGrp>
        <TotalAmt>916364</TotalAmt>
        <ProgramServicesAmt>694943</ProgramServicesAmt>
        <ManagementAndGeneralAmt>215419</ManagementAndGeneralAmt>
        <FundraisingAmt>6002</FundraisingAmt>
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      <TravelGrp>
        <TotalAmt>80431</TotalAmt>
        <ProgramServicesAmt>10610</ProgramServicesAmt>
        <ManagementAndGeneralAmt>35920</ManagementAndGeneralAmt>
        <FundraisingAmt>33901</FundraisingAmt>
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      <InterestGrp>
        <TotalAmt>524322</TotalAmt>
        <ProgramServicesAmt>524322</ProgramServicesAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>914955</TotalAmt>
        <ProgramServicesAmt>686216</ProgramServicesAmt>
        <ManagementAndGeneralAmt>228739</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>144838</TotalAmt>
        <ProgramServicesAmt>108629</ProgramServicesAmt>
        <ManagementAndGeneralAmt>36209</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>FOOD</Desc>
        <TotalAmt>635487</TotalAmt>
        <ProgramServicesAmt>635487</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>MISCELLANEOUS</Desc>
        <TotalAmt>208649</TotalAmt>
        <ProgramServicesAmt>4869</ProgramServicesAmt>
        <ManagementAndGeneralAmt>197529</ManagementAndGeneralAmt>
        <FundraisingAmt>6251</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>STUDENT ACTIVITIES</Desc>
        <TotalAmt>101480</TotalAmt>
        <ProgramServicesAmt>101480</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>DUES &amp; SUBSCRIPTIONS</Desc>
        <TotalAmt>32673</TotalAmt>
        <ProgramServicesAmt>1864</ProgramServicesAmt>
        <ManagementAndGeneralAmt>28067</ManagementAndGeneralAmt>
        <FundraisingAmt>2742</FundraisingAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>873</TotalAmt>
        <ManagementAndGeneralAmt>873</ManagementAndGeneralAmt>
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        <FundraisingAmt>345736</FundraisingAmt>
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        <EOYAmt>2015750</EOYAmt>
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        <EOYAmt>15882</EOYAmt>
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        <EOYAmt>95429</EOYAmt>
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        <EOYAmt>9074612</EOYAmt>
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        <EOYAmt>1581991</EOYAmt>
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        <EOYAmt>36423705</EOYAmt>
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        <EOYAmt>846261</EOYAmt>
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        <EOYAmt>15114635</EOYAmt>
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        <EOYAmt>7497573</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>23458469</EOYAmt>
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        <EOYAmt>10118822</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
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        <EOYAmt>2846414</EOYAmt>
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        <BOYAmt>11573605</BOYAmt>
        <EOYAmt>12965236</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>36423705</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>1336830</ReconcilationRevenueExpnssAmt>
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      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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        <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>
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        <InvestmentEarningsOrLossesAmt>59474</InvestmentEarningsOrLossesAmt>
        <GrantsOrScholarshipsAmt>59474</GrantsOrScholarshipsAmt>
        <EndYearBalanceAmt>1691436</EndYearBalanceAmt>
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        <GrantsOrScholarshipsAmt>67449</GrantsOrScholarshipsAmt>
        <EndYearBalanceAmt>1691436</EndYearBalanceAmt>
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        <EndYearBalanceAmt>1691436</EndYearBalanceAmt>
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        <Desc>PREPAID MISCELLANEOUS</Desc>
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        <Desc>PREPAID TUITION</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedFinclStmtAmt>4746</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>8920905</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>4746</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>4746</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL INTENDS TO USE THE ENDOWMENT FUNDS FOR SCHOLARSHIP AND TUTORIAL PROGRAMS, CAPITAL PURCHASES AND IMPROVEMENTS, EDUCATIONAL MATERIALS, FACULTY DEVELOPMENT, ATHLETIC PROGRAMS, GENERAL OPERATING EXPENSES, AS WELL AS TO MAINTAIN THE LONGEVITY OF THE SCHOOL.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>FIN 48 DISCLOSURE U.S. GENERALLY ACCEPTED ACCOUNTING PRINCIPLES REQUIRE AN ENTITY TO ASSESS THE PROBABILITY THAT A TAX POSITION HAS A "MORE LIKELY THAN NOT" (MTLN) SUSTAINABILITY AFTER REVIEW BY TAX AUTHORITIES. IF A TAX POSITION IS DEEMED NOT TO MEET THIS THRESHOLD, ANY UNRECOGNIZED TAX BENEFITS AND COSTS ARE ESTIMATED AND RECOGNIZED. INTEREST AND PENALTIES, IF ANY, RELATED TO ASSESSMENTS BY TAX AUTHORITIES WILL BE CLASSIFIED AS A COMPONENT OF INTEREST EXPENSE AND OTHER EXPENSE, RESPECTIVELY, IN THE STATEMENT OF ACTIVITIES. A TAX POSITION MAY BE CONSIDERED AS TAKEN ANY TIME A TAXPAYER CHOOSES AMONGST ALTERNATIVES THAT AFFECT THE AMOUNT OF THEIR TAX OBLIGATIONS AND INCLUDE FOR EXAMPLE: TAX EMEMPT STATUS; STATUS AS A PASS-THROUGH ENTITY(S CORPORATION); DECISIONS NOT TO FILE IN CERTAIN JURISDICTIONS; ALLOCATION OF INCOME BETWEEN JURISDICTIONS AND THE CHARACTERIZATION OF INCOME OR EXPENSES. TAX RETURNS ARE ROUTINELY OPEN FOR REVIEW BY THE TAX AUTHORITIES FOR THREE YEARS FROM THEIR DUE DATE. IN CERTAIN CIRCUMSTANCES THE STATUTE OF LIMITATIONS MAY REMAIN OPEN INDEFINITELY. HILLSIDE SCHOOL HAS BEEN NOTIFIED BY THE INTERNAL REVENUE SERVICE THAT IT MEETS THE QUALIFICATIONS TO BE CLASSIFIED AS A TAX EXEMPT ENTITY UNDER SECTION 501 (C)(3) OF THE INTERNAL REVENUE CODE. SINCE THE CONTINUANCE OF THIS STATUS IS BASED UPON CONTINUING QUALIFICATIONS, HILLSIDE SCHOOL HAS INDENTIFIED THIS AS A TAX POSITION. HOWEVER, IT HAS DETERMINED THAT THIS TAX POSITION MEETS MLTN SUSTAINABILITY AND DOES NOT RESULT IN AN UNCERTAINTY REQUIRING RECOGNITION. HILLSIDE SCHOOL HAS ALSO BEEN CLASSIFIED AS AN ENTITY THAT IS NOT A PRIVATE FOUNDATION WITHIN THE MEANING OF 509(A) AND QUALIFIES FOR DEDUCTIBLE CONTRIBUTIONS AS PROVIDED IN SECTION 170 (B)(1)(A)(VI).</ExplanationTxt>
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        <ExplanationTxt>RACIALLY NONDISCRIMINATORY POLICY EXPLAINED IN BROCHURE GIVEN TO PROSPECTIVE STUDENTS AND TO ORGANIZATIONS SUPPORTING THE SCHOOL. AS STATED IN THE BROCHURE, THE SCHOOL DOES NOT DISCRIMINATE AGAINST RACE, COLOR, RELIGION, OR NATIONAL ORIGIN. ADDITIONALLY, THE SCHOOL'S RACIALLY NONDISCRIMINATORY POLICY IS PUBLICIZED ON THE SCHOOL'S WEBSITE.</ExplanationTxt>
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        <ValuationMethodUsedDesc>FAIR MARKET VALUE OF STUDENT TUITION</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>SCHOLARSHIPS PROVIDED TO STUDENTS WHICH REDUCE THE AMOUNT OF TUITION THE STUDENT IS REQUIRED TO PAY THE SCHOOL</NonCashAssistanceDesc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
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        <TotalCompensationFilingOrgAmt>201569</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>SEAN HAYES</PersonNm>
        <TitleTxt>DIRECTOR OF ADMISSIONS</TitleTxt>
        <BaseCompensationFilingOrgAmt>147955</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>10000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>27734</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>185689</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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    <IRS990ScheduleK documentId="RetDoc1053100001">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>MASSACHUSETTS DEVELOPMENT FINANCE AGENCY</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>043431814</BondIssuerEIN>
        <CUSIPNum>57583RTD7</CUSIPNum>
        <BondIssuedDt>2019-10-16</BondIssuedDt>
        <IssuePriceAmt>16000000</IssuePriceAmt>
        <PurposeDesc>REFINANCE OF PRIOR CONSTRUCTION/RENOVATION DEBT AND NEW CONSTRUCTION.</PurposeDesc>
        <DefeasedInd>0</DefeasedInd>
        <OnBehalfOfIssuerInd>0</OnBehalfOfIssuerInd>
        <PoolFinancingInd>0</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
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        <BondReferenceCd>A</BondReferenceCd>
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        <RefundingTaxableBondsInd>0</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>0</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>0</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>0</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>0</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>0</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>0</AnyResearchAgreementsInd>
        <BondIssMeetPrvtSecPymtTestInd>0</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>0</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>0</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>0</Form8038TFiledInd>
        <RebateNotDueYetInd>0</RebateNotDueYetInd>
        <ExceptionToRebateInd>0</ExceptionToRebateInd>
        <NoRebateDueInd>0</NoRebateDueInd>
        <VariableRateIssueInd>0</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>0</HedgeIdentifiedInBksAndRecInd>
        <GrossProceedsInvestedInGICInd>0</GrossProceedsInvestedInGICInd>
        <GrossProceedsInvestedInd>0</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>0</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>0</ProceduresCorrectiveActionInd>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 - ORGANIZATION'S MISSION</FormAndLineReferenceDesc>
        <ExplanationTxt>TO EDUCATE MIDDLE SCHOOL BOYS - ACADEMICALLY, SOCIALLY, ATHLETICALLY, AND SPIRITUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL'S HEADMASTER, BUSINESS MANAGER, AND TREASURER OF THE BOARD OF TRUSTEES REVIEW THE FORM 990 PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, ALL MEMBERS OF THE BOARD OF TRUSTEES, THE HEADMASTER, ADMINISTRATORS, AND EMPLOYEES WITH PURCHASING AND/OR HIRING RESPONSIBILITIES OR AUTHORITY RECEIVE A LIST OF VENDORS WITH WHOM THE SCHOOL HAS TRANSACTED BUSINESS WITH DURING THE PRECEDING YEAR. ONCE THE AFOREMENTIONED INDIVIDUALS HAVE REVIEWED THE VENDOR LIST, THEY MUST COMPLETE A WRITTEN DISCLOSURE STATEMENT INDICATING ALL REPORTABLE CONFLICTS OR CONFIRMING THAT THERE ARE NO CONFLICTS TO REPORT. THE DISCLOSURE STATEMENTS ARE REVIEWED BY THE APPROPRIATE LEVEL OF AUTHORITY WITHIN THE SCHOOL.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE HEADMASTER'S COMPENSATION COMMITTEE DETERMINES THE COMPENSATION OF THE HEADMASTER. ADDITIONALLY, THE EXECUTIVE COMMITTEE OF THE BOARD OF TRUSTEES REVIEWS THE HEADMASTER'S COMPENSATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE SCHOOL'S GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE THROUGH THE HEADMASTER'S OFFICE UPON REQUEST. THE FINANCIAL STATEMENTS OF THE SCHOOL ARE NOT DISTRIBUTED TO THE PUBLIC.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990 PART XII LINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS A FINANCE COMMITTEE THAT ASSUMES RESPONSIBILITY FOR THE OVERSIGHT OF THE AUDIT OF THE FINANCIAL STATEMENTS AND THE SELECTION OF THE INDEPENDENT ACCOUNTANT. THE PROCESS HAS NOT CHANGED FROM PRIOR YEARS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
