Sudoku #x287

Sudoku game, level: Expert #287. This Sudoku have 28 given numbers (clues)..
Structure: 5 (1 pcs.), 2 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 4 (3 pcs.), 1 (4 pcs.), 3 (4 pcs.), 6 (4 pcs.), 7 (6 pcs.), ∑28.


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