1 for (int c0 = 0; c0 <= 8; c0 += 1) {
2   for (int c1 = 0; c1 <= -c0 + 8; c1 += 1)
3     for (int c2 = 10 * c0; c2 <= 10 * c0 + 9; c2 += 1)
4       for (int c3 = 10 * c1; c3 <= 10 * c1 + 9; c3 += 1)
5         A(c2, c3);
6   for (int c1 = -c0 + 9; c1 <= -c0 + 10; c1 += 1)
7     for (int c2 = 10 * c0; c2 <= min(10 * c0 + 9, -10 * c1 + 100); c2 += 1)
8       for (int c3 = 10 * c1; c3 <= min(10 * c1 + 9, -c2 + 100); c3 += 1)
9         A(c2, c3);
10 }
11 for (int c0 = 9; c0 <= 10; c0 += 1)
12   for (int c1 = 0; c1 <= -c0 + 10; c1 += 1)
13     for (int c2 = 10 * c0; c2 <= min(10 * c0 + 9, -10 * c1 + 100); c2 += 1)
14       for (int c3 = 10 * c1; c3 <= min(10 * c1 + 9, -c2 + 100); c3 += 1)
15         A(c2, c3);
16