Sudoku #x41

Sudoku game, level: Expert #41. This Sudoku have 30 given numbers (clues)..
Structure: 5 (1 pcs.), 8 (2 pcs.), 9 (2 pcs.), 2 (3 pcs.), 1 (3 pcs.), 4 (4 pcs.), 7 (4 pcs.), 3 (5 pcs.), 6 (6 pcs.), ∑30.


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