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let the angle EBD be added to each;
therefore the angles CBE, EBD are equal to the three angles CBA, ABE, EBD. [C.N.2]
Again, since the angle ABD is equal to the two angles ABE, EBD,
let the angle CBA be added to each;
therefore the angles CBA, ABD are equal to the three angles CBA, ABE, EBD. [C.N.2] .
