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