*-----------*
|8.6|.5.|..1|
|...|.8.|97.|
|...|..4|2..|
|---+---+---|
|2.1|..3|..9|
|...|426|...|
|7..|1..|6.3|
|---+---+---|
|..7|2..|...|
|.94|.3.|...|
|5..|.4.|7.8|
*-----------*