1 for (int c0 = 0; c0 <= M; c0 += 1) 2 S1(c0); 3 for (int c0 = 1; c0 <= M; c0 += 1) 4 S2(c0); 5 for (int c0 = 0; c0 <= M; c0 += 1) 6 S3(c0); 7