Sudoku #m806

Sudoku game, level: Medium #806. This Sudoku have 23 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 5 (2 pcs.), 7 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 6 (3 pcs.), 3 (4 pcs.), 4 (4 pcs.), ∑23.


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