Sudoku #x29

Sudoku game, level: Expert #29. This Sudoku have 21 given numbers (clues)..
Structure: 7 (1 pcs.), 8 (1 pcs.), 9 (1 pcs.), 5 (2 pcs.), 6 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 1 (4 pcs.), 2 (4 pcs.), ∑21.


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