A.k1 B.k2 C.k1-k2 D.k1+k2
A.n B.ne C.e D.2e
A.s B.s-1 C.s+1 D.2s
A.1,2,5,4,3 B.1,2,3,4,5 C.1,2,5,3,4 D.1,4,3,2,5