*-----------*
|...|.21|6.9|
|...|8..|...|
|.65|..7|8..|
|---+---+---|
|.3.|17.|..4|
|.5.|...|.9.|
|6..|.52|.8.|
|---+---+---|
|..8|2..|95.|
|...|..3|...|
|2.1|78.|...|
*-----------*