Sudoku #h789

Sudoku game, level: Hard #789. This Sudoku have 28 given numbers (clues)..
Structure: 5 (1 pcs.), 1 (2 pcs.), 2 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 4 (3 pcs.), 3 (5 pcs.), 7 (5 pcs.), 6 (6 pcs.), ∑28.


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