1for (int c0 = 1; c0 <= 18; c0 += 1)
2  if (c0 <= 9 && c0 >= 2) {
3    for (int c1 = 1; c1 <= 9; c1 += 1) {
4      if (c0 % 2 == 0)
5        s0(c1, c0 / 2);
6      s1(c1, c0);
7    }
8  } else if (c0 == 1) {
9    for (int c1 = 1; c1 <= 9; c1 += 1)
10      s1(c1, 1);
11  } else if (c0 % 2 == 0)
12    for (int c1 = 1; c1 <= 9; c1 += 1)
13      s0(c1, c0 / 2);
14