InterviewSolution
<P>`{:(P,Q,R,S),(2.3,2.4,2.3,2.4):}``{:(P,Q,R,S),(1.3,2,4.2,3):}``{:(P,Q,R,S),(4,3,2.1,2.3):}``{:(P,Q,R,S),(3.1,4.1,1,2):}`
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