Sudoku #h151

Sudoku game, level: Hard #151. This Sudoku have 24 given numbers (clues)..
Structure: 3 (1 pcs.), 2 (2 pcs.), 4 (2 pcs.), 9 (2 pcs.), 5 (3 pcs.), 7 (3 pcs.), 8 (3 pcs.), 1 (4 pcs.), 6 (4 pcs.), ∑24.


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