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Book I   Proposition 44
    Let the parallelogram BEFG be constructed equal to the triangle C, in the angle EBG which is equal to D; [I.42]
    let it be placed so that BE is in a straight line with AB;

    let FG be drawn through to H,
and
    let AH be drawn through A parallel to either BG or EF. [I.31]

    Let HB be joined.
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