Sudoku #x254

Sudoku game, level: Expert #254. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 9 (2 pcs.), 4 (2 pcs.), 5 (2 pcs.), 6 (3 pcs.), 8 (4 pcs.), 7 (4 pcs.), 3 (4 pcs.), 2 (5 pcs.), ∑28.


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