1 2 3 | 4 5 6 | 7 8 9 
4 5 6 | 7 8 9 | 1 2 3 
7 8 9 | 1 2 3 | 4 5 6 
------+-------+-------
2 3 4 | 5 6 7 | 8 9 1 
5 6 7 | 8 9 1 | 2 3 4 
8 9 1 | 2 3 4 | 5 6 7 
------+-------+-------
3 4 5 | 6 7 8 | 9 1 2 
6 7 8 | 9 1 2 | 3 4 5 
9 1 2 | 3 4 5 | 6 7 8 
