Sudoku #h527

Sudoku game, level: Hard #527. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 2 (1 pcs.), 3 (3 pcs.), 4 (3 pcs.), 5 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 6 (4 pcs.), 8 (4 pcs.), ∑25.


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