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(4)2. Identify a single logical equivalence or rule of inference which can be used to show that the conclusion follows from the given premises: a. 1. (qs)p 2. Therefore, qp b. 1. (pq)r 2. r(st) 3. Therefore, (pq)(st) c. 1. p(qr) 2. r 3. Therefore, pq d. 1. (p(qr)) 2. Therefore, (p(qr))