Sudoku #x519

Sudoku game, level: Expert #519. This Sudoku have 30 given numbers (clues)..
Structure: 6 (1 pcs.), 2 (2 pcs.), 8 (2 pcs.), 3 (3 pcs.), 7 (4 pcs.), 5 (4 pcs.), 1 (4 pcs.), 9 (5 pcs.), 4 (5 pcs.), ∑30.


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