
6 0 1  0 5 0  0 0 0
0 9 0  8 0 0  1 0 0
0 0 4  0 0 0  0 6 0

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

0 0 0  0 0 6  0 2 9
0 0 0  0 0 0  0 0 0
3 0 0  5 4 9  0 0 0

hard 

