Sudoku #x500

Sudoku game, level: Expert #500. This Sudoku have 28 given numbers (clues)..
Structure: 4 (1 pcs.), 8 (2 pcs.), 9 (2 pcs.), 1 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 5 (4 pcs.), 2 (5 pcs.), 3 (5 pcs.), ∑28.


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