Determine for each of the following truth functional statements whether it is a tautology, a contradiction, or contingent.

Determine for each of the following truth functional statements whether it is a tautology, a contradiction, or contingent. You can use a truth table to determine their status or a shorter method but whatever method you choose, show enough reasoning to confirm your verdict.

If not (W only if not Z) then (Z or not W)

not [(not G if M) and not (if not G then M)]

If (A if and only if not B) then not (B if not A)

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