x_1, x_2, d
1, 6, 1
7, 9, -1
1, 9, 1
7, 10, -1
2, 5, -1
2, 7, 1
2, 8, 1
6, 8, -1
6, 9, -1
3, 5, -1
3, 6, -1
3, 8, 1
3, 9, 1
5, 7, -1
5, 8, -1
5, 10, 1
5, 11, 1
4, 6, -1
4, 7, -1
4, 9, 1
4, 10, 1