Sudoku #h37

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


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