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Book I   Proposition 35
For, since ABCD is a parallelogram,
AD is equal to BC.
For the same reason (EBCF is a parallelogram) also
EF is equal to BC,
so that
    AD is also equal to EF; [C.N.1]

and
    DE is common;
therefore
    the whole AE is equal to the whole DF. [C.N.2]
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