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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>Greenhouse E3 contracts with Abacus Education Partners, LLC for various finance and accounting services, including the services of CFO Michael Buerger reported on Part VII. Abacus was paid $21,129 for services in calendar year 2022.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The CEO reviews Form 990 with the board prior to filing with the IRS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All board members are covered under the conflict of interest policy that determines whether a conflict exists. The board as a whole reviews responses to the conflict of interest policy. If a potential conflict of interest exists, the person with a conflict is prohibited from participating in governing board deliberations and decisions regarding the conflicted transaction.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation data is compiled by management and provided to the board for deliberation and determination of compensation for the CEO and the CFO. This data was from third party sources for individuals in similar positions at similar organizations.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>Available upon request.</ExplanationTxt>
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</Return>
