Original
========
___1__74_
_5__9__32
__67__9__
4__8_____
_2_____1_
_____9__5
__4__73__
73__2__6_
_65__4___

Solution
========
283156749
157498632
316742958
471835296
529683417
642319875
894567321
738921564
965274183