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