*-----------*
|...|3.1|...|
|76.|...|.2.|
|.9.|.6.|43.|
|---+---+---|
|1..|9..|.6.|
|..6|5.4|8..|
|.7.|..6|..4|
|---+---+---|
|.42|.5.|.9.|
|.3.|...|.85|
|...|8.9|...|
*-----------*