[M, N] -> { S1[0, i1] -> [0, i1, 0] : i1 <= M and N >= 0 and i1 >= 1; S2[i0, i1] -> [i0, i1, 1] : i0 >= 1 and i1 <= M and i0 <= N and i1 >= 1 }
[M, N] -> {  : M >= 1 and N >= 1 }
[M, N] -> { [i, j, k] -> separate[o0] }