Sudoku #x580

Sudoku game, level: Expert #580. This Sudoku have 30 given numbers (clues)..
Structure: 8 (2 pcs.), 7 (3 pcs.), 9 (3 pcs.), 6 (3 pcs.), 5 (3 pcs.), 1 (3 pcs.), 3 (4 pcs.), 2 (4 pcs.), 4 (5 pcs.), ∑30.


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9
4
6
3
3
5
4
1
9
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2
6
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8
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7
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2
6
5
8
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4
7
3
7
2
9
3
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