Sudoku #x402

Sudoku game, level: Expert #402. This Sudoku have 31 given numbers (clues)..
Structure: 8 (2 pcs.), 1 (3 pcs.), 5 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 3 (4 pcs.), 6 (4 pcs.), 4 (5 pcs.), ∑31.


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8
7
3
6
4
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4
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7
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9
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4
3
9
1
8
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