Sudoku #x510

Sudoku game, level: Expert #510. This Sudoku have 30 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 4 (2 pcs.), 7 (2 pcs.), 5 (3 pcs.), 9 (3 pcs.), 3 (5 pcs.), 8 (5 pcs.), 6 (6 pcs.), ∑30.


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