8
0 1 2 | 0 1 2
1 2 3 | 0 1 2
2 3 4 | 0 1 2
3 4 5 | 0 1 2
4 5 6 | 0 1 2
5 6 7 | 0 1 2
6 7 8 | 0 1 2
7 8 9 | 0 1 2