InterviewSolution
`{:(A,B,C,D),("4,8","1,5","2,6","3,7"):}``{:(A,B,C,D),("4,8","1,7","2,6","3,5"):}``{:(A,B,C,D),("4,6,8",5,"1,2","3,7"):}``{:(A,B,C,D),("4,6,8",7,"1,2","3,5"):}`
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