-------------
|   |4  | 9 |
|  1|6  |8  |
|  3|   |  4|
-------------
|8  | 2 | 6 |
|56 |  9| 1 |
|   |57 |   |
-------------
|2  | 6 |  1|
|1  |7  |  3|
| 48|9  | 7 |
-------------
