1for (int c0 = 2; c0 <= 9; c0 += 1)
2  if (c0 >= 5) {
3    s1(c0, 1);
4    for (int c1 = 2; c1 <= 9; c1 += 1) {
5      s1(c0, c1);
6      s0(c0, c1);
7    }
8  } else
9    for (int c1 = 2; c1 <= 9; c1 += 1)
10      s0(c0, c1);
11