Sudoku #h453

Sudoku game, level: Hard #453. This Sudoku have 31 given numbers (clues)..
Structure: 3 (0 pcs.), 7 (1 pcs.), 2 (3 pcs.), 4 (3 pcs.), 1 (4 pcs.), 5 (4 pcs.), 9 (4 pcs.), 6 (5 pcs.), 8 (7 pcs.), ∑31.


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6
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