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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE DIRECTOR AND PRESIDENT OF THE ORGANIZATION ARE MARRIED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF THE FORM 990 IS REVIEWED BY THE BOARD OF DIRECTORS; APPROVAL IS OBTAINED BEFORE THE RETURN IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>SEYMOUR INSTITUTE'S EXECUTIVE COMPENSATION PROGRAM IS ADMINISTERED BY INDEPENDENT MEMBERS OF THE BOARD OF DIRECTORS. THE BOARD IS RESPONSIBLE FOR ESTABLISHING AND MAINTAINING A COMPETITIVE COMPENSATION PROGRAM FOR THE KEY EXECUTIVES AND KEY EMPLOYEES OF THE ORGANIZATION. THE BOARD MEETS AS NEEDED TO REVIEW THE COMPENSATION PROGRAM AND MAKES ADJUSTMENTS, AS APPROPRIATE. REVIEW AND APPROVAL OF SALARIES AND OTHER COMPENSATION FOR THE KEY EXECUTIVES AND KEY EMPLOYEES IS PERFORMED BY INDEPENDENT BOARD MEMBERS ON AN ANNUAL BASIS, AND IS INTENDED TO ENSURE THAT THE COMPENSATION PROGRAM FALLS WITHIN A REASONABLE RANGE OF COMPETITIVE PRACTICES FOR COMPARABLE POSITIONS AMONG SIMILARLY SITUATED ORGANIZATIONS. IN TAX YEAR 2023, THE INDEPENDENT BOARD MEMBERS USED COMPARABILITY INFORMATION ON COMPENSATION DERIVED FROM THEIR OWN PROFESSIONAL EXPERIENCE FROM SERVICE ON OTHER NONPROFIT BOARDS AND EMPLOYMENT AT SIMILAR ORGANIZATIONS.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS FILINGS AND GOVERNING DOCUMENTS AVAILABLE TO THE PUBLIC VIA FILINGS WITH THE MASSACHUSETTS ATTORNEY GENERAL AND UPON REQUEST.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
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</Return>