Sudoku #x37

Sudoku game, level: Expert #37. This Sudoku have 27 given numbers (clues)..
Structure: 1 (1 pcs.), 4 (2 pcs.), 9 (2 pcs.), 3 (3 pcs.), 5 (3 pcs.), 2 (4 pcs.), 6 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), ∑27.


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