Sudoku #x905

Sudoku game, level: Expert #905. This Sudoku have 30 given numbers (clues)..
Structure: 4 (2 pcs.), 6 (2 pcs.), 7 (2 pcs.), 2 (3 pcs.), 8 (3 pcs.), 1 (4 pcs.), 3 (4 pcs.), 5 (4 pcs.), 9 (6 pcs.), ∑30.


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