Sudoku #h679

Sudoku game, level: Hard #679. This Sudoku have 24 given numbers (clues)..
Structure: 1 (1 pcs.), 4 (2 pcs.), 7 (2 pcs.), 8 (2 pcs.), 2 (3 pcs.), 3 (3 pcs.), 9 (3 pcs.), 5 (4 pcs.), 6 (4 pcs.), ∑24.


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