A.1 B.2 C.3 D.4
A.1,2,3,4 B.1,3,4,2 C.1,4,2,3 D.1,4,3,2
A.1,6,5,4,3,2 B.1,3,5,2,4,6 C.1,4,2,6,3,5 D.1,2,4,3,5,6