
0 0 0  0 0 6  0 0 0
0 7 0  0 0 0  0 0 0
6 3 0  0 1 0  0 7 4

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

7 9 0  0 0 0  0 8 1
0 0 0  0 0 0  0 6 0
0 0 0  7 0 0  0 0 0

hard
any comments may be put here
following data...

