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