*-----------*
|.48|2..|...|
|3..|769|...|
|..6|...|...|
|---+---+---|
|.1.|3..|4..|
|.3.|675|.1.|
|..7|..2|.3.|
|---+---+---|
|...|...|9..|
|...|853|..7|
|...|..7|85.|
*-----------*