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Book IV   Proposition 3
    Let EF be produced in both directions to the points G, H,
    let the center K of the circle ABC be taken, [III.1]
and
    let the straight line KB be drawn across at random;

on the straight line KB, and at the point Kon it,
    let the angle BKA be constructed equal to the angle DEG, and
    the angle BKC equal to the angle DFH; [I.23]

and through the points A, B, C
    let LAM, MBN, NCL be drawn touching the circle ABC. [III.16, Por.]
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