Sudoku #x617

Sudoku game, level: Expert #617. This Sudoku have 28 given numbers (clues)..
Structure: 6 (1 pcs.), 1 (3 pcs.), 3 (3 pcs.), 5 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 4 (5 pcs.), ∑28.


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