Sudoku #x53

Sudoku game, level: Expert #53. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 3 (2 pcs.), 8 (2 pcs.), 4 (3 pcs.), 5 (3 pcs.), 6 (4 pcs.), 7 (5 pcs.), 9 (5 pcs.), ∑28.


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