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- . The definition of one-to-one function f: X Y states that V x and x2 EX, if f(x) = f(x2) then x =

- . The definition of one-to-one function f: X Y states that V x and x2 EX, if f(x) = f(x2) then x = x2. Write the contrapositive of the definition. (Make sure you include the quantifier!)

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