Sudoku #x419

Sudoku game, level: Expert #419. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 4 (2 pcs.), 3 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 8 (3 pcs.), 7 (4 pcs.), 9 (4 pcs.), 1 (5 pcs.), ∑28.


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