Sudoku #m579

Sudoku game, level: Medium #579. This Sudoku have 23 given numbers (clues)..
Structure: 7 (1 pcs.), 4 (2 pcs.), 6 (2 pcs.), 8 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 5 (3 pcs.), 9 (3 pcs.), 1 (4 pcs.), ∑23.


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