Sudoku #x478

Sudoku game, level: Expert #478. This Sudoku have 27 given numbers (clues)..
Structure: 1 (1 pcs.), 4 (1 pcs.), 2 (2 pcs.), 5 (3 pcs.), 9 (3 pcs.), 3 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), 6 (5 pcs.), ∑27.


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