InterviewSolution
<P>`{:(P, Q, R, S),(3, 2, 1, 4):}``{:(P, Q, R, S),(2, 4, 1, 3):}``{:(P, Q, R, S),(3, 1, 2, 4):}``{:(P, Q, R, S),(2, 3, 1, 4):}`
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