Sudoku #x728

Sudoku game, level: Expert #728. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 6 (1 pcs.), 3 (2 pcs.), 4 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 8 (4 pcs.), 5 (5 pcs.), 1 (6 pcs.), ∑28.


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