Sudoku #x20

Sudoku game, level: Expert #20. This Sudoku have 30 given numbers (clues)..
Structure: 5 (1 pcs.), 3 (2 pcs.), 4 (3 pcs.), 6 (3 pcs.), 8 (3 pcs.), 1 (4 pcs.), 2 (4 pcs.), 9 (4 pcs.), 7 (6 pcs.), ∑30.


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