1 {
2   for (int c1 = 0; c1 <= 7; c1 += 1)
3     s0(1, c1);
4   for (int c0 = 2; c0 <= 6; c0 += 1) {
5     for (int c1 = 0; c1 < c0 - 1; c1 += 1)
6       s1(c0, c1);
7     for (int c1 = c0 - 1; c1 <= 4; c1 += 1) {
8       s1(c0, c1);
9       s0(c0, c1);
10     }
11     for (int c1 = 5; c1 <= 7; c1 += 1)
12       s0(c0, c1);
13   }
14   for (int c0 = 7; c0 <= 8; c0 += 1)
15     for (int c1 = c0 - 1; c1 <= 7; c1 += 1)
16       s0(c0, c1);
17 }
18