*-----------*
|3..|.5.|...|
|.28|3..|...|
|.5.|..7|.39|
|---+---+---|
|5..|.4.|31.|
|2..|...|..7|
|.83|.2.|..6|
|---+---+---|
|94.|8..|.5.|
|...|..3|27.|
|...|.6.|..8|
*-----------*