(3,9) 7 2 6 1 8 (5,9) (3,4) (3,4,5,9)
8 (6,9) (3,6) 4 5 7 (1,9) 2 (1,3,4,9)
1 4 5 3 2 9 8 6 7
(3,4) 5 (3,4,7) 9 8 6 2 (1,3,7) (1,3,5)
2 1 9 7 3 5 4 8 6
(3,6) 8 (3,6,7) 1 4 2 (5,7) 9 (3,5)
7 (6,9) (1,4) 2 (6,9) (1,4) 3 5 8
(4,6,9) 3 8 5 (6,9) (1,4) (1,6,7) (1,4,7) 2
5 2 (1,4,6) 8 7 3 (1,6,9) (1,4) (1,4,9)
thx