Sudoku #x444

Sudoku game, level: Expert #444. This Sudoku have 30 given numbers (clues)..
Structure: 6 (1 pcs.), 2 (2 pcs.), 8 (2 pcs.), 4 (3 pcs.), 1 (4 pcs.), 3 (4 pcs.), 5 (4 pcs.), 7 (4 pcs.), 9 (6 pcs.), ∑30.


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