1for (int c0 = 1; c0 <= 8; c0 += 1)
2  for (int c1 = 0; c1 <= 7; c1 += 1) {
3    if (c1 <= 4 && c0 <= 6 && c0 >= 2)
4      s1(c0, c1);
5    if (c1 + 1 >= c0)
6      s0(c0, c1);
7  }
8