Sudoku #h39

Sudoku game, level: Hard #39. This Sudoku have 25 given numbers (clues)..
Structure: 9 (1 pcs.), 4 (2 pcs.), 5 (2 pcs.), 8 (2 pcs.), 3 (3 pcs.), 7 (3 pcs.), 1 (4 pcs.), 2 (4 pcs.), 6 (4 pcs.), ∑25.


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