Sudoku #x320

Sudoku game, level: Expert #320. This Sudoku have 31 given numbers (clues)..
Structure: 3 (1 pcs.), 8 (1 pcs.), 6 (1 pcs.), 5 (3 pcs.), 4 (4 pcs.), 2 (4 pcs.), 7 (5 pcs.), 1 (5 pcs.), 9 (7 pcs.), ∑31.


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9
4
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9
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9
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9
7
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