Sudoku #x431

Sudoku game, level: Expert #431. This Sudoku have 30 given numbers (clues)..
Structure: 9 (2 pcs.), 3 (2 pcs.), 6 (2 pcs.), 1 (3 pcs.), 4 (3 pcs.), 2 (3 pcs.), 7 (4 pcs.), 8 (5 pcs.), 5 (6 pcs.), ∑30.


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9
7
7
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8
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6
5
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