Sudoku #x690

Sudoku game, level: Expert #690. This Sudoku have 27 given numbers (clues)..
Structure: 1 (2 pcs.), 4 (2 pcs.), 5 (2 pcs.), 9 (2 pcs.), 3 (3 pcs.), 6 (3 pcs.), 7 (4 pcs.), 8 (4 pcs.), 2 (5 pcs.), ∑27.


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