[ 5 3 _ _ 7 _ _ _ _ ]
[ 6 _ _ 1 9 5 _ _ _ ]
[ _ 9 8 _ _ _ _ 6 _ ]
[ 8 _ _ _ 6 _ _ _ 3 ]
[ 4 _ _ 8 _ 3 _ _ 1 ]
[ 7 _ _ _ 2 _ _ _ 6 ]
[ _ 6 _ _ _ _ 2 8 _ ]
[ _ _ _ 4 1 9 _ _ 5 ]
[ _ _ _ _ 8 _ _ 7 9 ]