Sudoku #x78

Sudoku game, level: Expert #78. This Sudoku have 27 given numbers (clues)..
Structure: 3 (0 pcs.), 2 (1 pcs.), 4 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 7 (3 pcs.), 8 (4 pcs.), 9 (4 pcs.), 1 (6 pcs.), ∑27.


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