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Book I   Proposition 23
On the straight lines CD, CE respectively let the points D, E be taken at random;
    let DE be joined,

and out of three straight lines which are equal to the three straight lines CD, CE, DE
    let the triangle AFG be constructed
in such a way that
    AF is equal to CD,
    AG to CE,
and further
    FG to DE. [I.22]
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