8 8
8 0 0 0 0 0 0 0
7 8 0 0 0 0 0 0
6 7 8 0 0 0 0 0
5 6 7 8 0 0 0 0
4 5 6 7 8 0 0 0
3 4 5 6 7 8 0 0
2 3 4 5 6 7 8 0
1 2 3 4 5 6 7 8