examples.sudoku

0 0 0 0 0 0 8 1 0
0 4 0 8 0 6 0 0 0
0 0 5 0 0 2 0 9 0
8 7 0 4 0 1 9 0 0
0 0 0 0 7 0 0 0 0
0 0 4 5 0 9 0 8 3
0 6 0 1 0 0 4 0 0
0 0 0 6 0 5 0 2 0
0 2 8 0 0 0 0 0 0

=================

0 5 2 0 7 0 8 1 0
0 0 8 0 0 0 0 0 7
7 0 6 0 0 2 0 3 0
0 0 0 4 6 3 0 9 0
2 6 0 9 0 8 0 5 3
0 3 0 2 5 7 0 0 0
0 2 0 7 0 0 5 0 8
4 0 0 0 0 0 6 0 0
0 1 7 0 4 0 3 2 0

=================

5 2 0 4 7 0 0 0 8
0 0 9 0 0 5 0 0 4
0 0 0 8 0 9 0 7 5
0 0 0 0 0 6 0 8 0
9 0 0 0 0 0 0 0 2
0 3 0 2 0 0 0 0 0
1 9 0 3 0 4 0 0 0
8 0 0 6 0 0 5 0 0
2 0 0 0 8 1 0 3 9

=================

0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0