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f : A → A = {(1,4) , (2,3) , (3,1) , (4,3)}
f : A → B = {(1,2), (2,5), (3,1), (4,3), (2,4)}
f : A → B = {(1,3) , (2,1) , (3,2) , (4,4)}
f: B → B = {(1,3), (2,1), (3,2), (4,4), (5,5)}
f : B → A = {(1,3), (2,4), (5,1), (3,3), (4,2)}
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