*-----------*
|4.8|...|...|
|.2.|..9|..6|
|..9|.8.|5..|
|---+---+---|
|.84|7..|6.2|
|...|3.1|...|
|5.3|..2|79.|
|---+---+---|
|..2|.7.|3..|
|8..|5..|.2.|
|...|...|1.8|
*-----------*