Sudoku #x531

Sudoku game, level: Expert #531. This Sudoku have 26 given numbers (clues)..
Structure: 1 (1 pcs.), 5 (1 pcs.), 2 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 9 (3 pcs.), 7 (4 pcs.), 8 (4 pcs.), 6 (5 pcs.), ∑26.


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