*-----------*
|..3|628|..7|
|84.|...|..3|
|1..|9.4|...|
|---+---+---|
|...|8..|.2.|
|3..|.4.|..6|
|.5.|..1|...|
|---+---+---|
|...|3.2|..8|
|4..|...|.52|
|2..|456|1..|
*-----------*