-------------
|   | 1 |  5|
|   |4  |7 2|
|   | 8 |6  |
-------------
|  8|   |4  |
| 6 |  5|   |
|1  |9  | 3 |
-------------
|34 | 6 | 1 |
|   |2  |9  |
| 5 |  7|   |
-------------
