*-----------*
|8..|9..|3.1|
|...|..7|.69|
|...|3.6|4..|
|---+---+---|
|.97|..8|.5.|
|6..|...|..8|
|.2.|5..|73.|
|---+---+---|
|..4|6.3|...|
|56.|8..|...|
|7.1|..9|..2|
*-----------*