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S		 Book I   Proposition 2
Then, since
    the point B is the center of the circle CGH,
    BC is equal to BG.

Again, since
    the point D is the center of the circle GKL,
    DL is equal to DG;
and of these
    DA is equal to DB.
Therefore
    the remainder AL is equal to the remainder BG. [C.N.3]
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