1S3(1, 0);2for (int c2 = 2; c2 <= M; c2 += 1)3 S1(1, 1, c2);4for (int c0 = 2; c0 <= M; c0 += 1) {5 S4(c0, 0);6 for (int c2 = c0 + 1; c2 <= M; c2 += 1)7 S2(c0, 1, c2);8}9
