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In a Boolean ring (R,+,,0,1)(R, +, \cdot, 0, 1), addition represents exclusive OR (PQ=P+QP \oplus Q = P + Q) and multiplication represents conjunction (PQ=PQP \land Q = P \cdot Q). Which of the following polynomials represents the classical implication (P    Q)    Q(P \implies Q) \implies Q?