Sudoku #h658

Sudoku game, level: Hard #658. This Sudoku have 27 given numbers (clues)..
Structure: 1 (1 pcs.), 2 (3 pcs.), 3 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 4 (4 pcs.), 5 (4 pcs.), ∑27.


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