Sudoku #m797

Sudoku game, level: Medium #797. This Sudoku have 23 given numbers (clues)..
Structure: 2 (1 pcs.), 3 (1 pcs.), 5 (2 pcs.), 1 (3 pcs.), 4 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 6 (4 pcs.), ∑23.


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