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

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

0 3 0  5 0 0  6 2 0
2 8 0  0 0 0  0 0 1
0 0 6  0 0 0  0 0 0

row 3 hidden pair, 
then col 1 hidden triple
then row 2/ col 8 hidden pair
then row 2 hidden quad
then col 2 hidden triple
