[M, N] -> { S3[i0, i1] -> [2N + i1] : i0 >= 1 and i0 <= N and i1 >= 1 and i1 <= M; S2[i0, i1] -> [N + i1] : i0 >= 1 and i0 <= N and i1 >= 1 and i1 <= M; S1[i0] -> [i0] : i0 >= 1 and i0 <= N }
[M, N] -> {  : N <= M and M >= 2 and N >= 2 }
[M, N] -> { [i] -> separate[o0] }