1for (int c0 = 1; c0 <= M; c0 += 1) {2 for (int c1 = 1; c1 < c0; c1 += 1)3 S1(c0, c1);4 S1(c0, c0);5 S2(c0, c0);6 for (int c1 = c0 + 1; c1 <= M; c1 += 1)7 S1(c0, c1);8}9
