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Which of the following propositions are tautologies? For tautologies, use equivalences to show it (state the names of the equivalences used in your proof). If

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Which of the following propositions are tautologies? For tautologies, use equivalences to show it (state the names of the equivalences used in your proof). If it is not a tautology, give a counterexample. Do NOT use truth tables. (c) (pq)q (d) (pq)(qp)

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