Sudoku #x280

Sudoku game, level: Expert #280. This Sudoku have 27 given numbers (clues)..
Structure: 1 (1 pcs.), 4 (2 pcs.), 7 (3 pcs.), 3 (3 pcs.), 2 (3 pcs.), 8 (3 pcs.), 9 (4 pcs.), 5 (4 pcs.), 6 (4 pcs.), ∑27.


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