Sudoku #x59

Sudoku game, level: Expert #59. This Sudoku have 30 given numbers (clues)..
Structure: 3 (1 pcs.), 6 (2 pcs.), 5 (2 pcs.), 7 (3 pcs.), 1 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), 2 (5 pcs.), 4 (7 pcs.), ∑30.


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