*-----------*
|...|.8.|..4|
|...|.59|...|
|.5.|6.2|3..|
|---+---+---|
|.3.|9..|5.6|
|.86|...|97.|
|9.5|..8|.3.|
|---+---+---|
|..8|4.5|.9.|
|...|79.|...|
|4..|.2.|...|
*-----------*