Sudoku #x523

Sudoku game, level: Expert #523. This Sudoku have 25 given numbers (clues)..
Structure: 7 (2 pcs.), 4 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 6 (3 pcs.), 3 (4 pcs.), 5 (4 pcs.), ∑25.


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