Sudoku #x84

Sudoku game, level: Expert #84. This Sudoku have 31 given numbers (clues)..
Structure: 7 (2 pcs.), 2 (2 pcs.), 6 (3 pcs.), 1 (3 pcs.), 3 (3 pcs.), 8 (4 pcs.), 5 (4 pcs.), 9 (5 pcs.), 4 (5 pcs.), ∑31.


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9
1
5
8
6
3
9
8
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7
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7
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9
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6
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6
8
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9
5
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