Sudoku #x857

Sudoku game, level: Expert #857. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 3 (1 pcs.), 8 (2 pcs.), 2 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 4 (4 pcs.), 5 (5 pcs.), ∑25.


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