Sudoku #x77

Sudoku game, level: Expert #77. This Sudoku have 25 given numbers (clues)..
Structure: 7 (1 pcs.), 2 (1 pcs.), 1 (2 pcs.), 8 (2 pcs.), 3 (3 pcs.), 4 (4 pcs.), 5 (4 pcs.), 6 (4 pcs.), 9 (4 pcs.), ∑25.


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