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