Prove that for all integers m and n , m-n is even if, and only if, both m and n are even or both m and n are odd.

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Prove that for all integers m and n , m-n is even if, and only if, both m and n are even or both m and n are odd.

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Prove that for all integers m and n,m-n is even if, and only if, both m and n are even or both m and n are odd.

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