Sudoku #h684

Sudoku game, level: Hard #684. This Sudoku have 28 given numbers (clues)..
Structure: 7 (1 pcs.), 1 (1 pcs.), 8 (1 pcs.), 9 (2 pcs.), 5 (3 pcs.), 2 (4 pcs.), 4 (4 pcs.), 3 (5 pcs.), 6 (7 pcs.), ∑28.


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3
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6
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9
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9
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6
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4
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