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S		 Book IV   Proposition 2
    Let GH be drawn touching the circle ABC at A; [III.16, Por.]

on the straight line AH, and at the point A on it,
    let the the angle HAC be constructed equal to the angle DEF,
and on the straight line AG, and at the point A on it,
    let the angle GAB be constructed equal to the angle DFE; [I.23]
    let BC be joined.
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