*-----------*
|..7|4..|18.|
|6..|...|...|
|...|3.7|.92|
|---+---+---|
|...|75.|.4.|
|8..|2.1|..5|
|.6.|.49|...|
|---+---+---|
|98.|1.4|...|
|...|...|..4|
|.16|..2|7..|
*-----------*