Sudoku #x600

Sudoku game, level: Expert #600. This Sudoku have 28 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 3 (2 pcs.), 8 (2 pcs.), 4 (3 pcs.), 5 (4 pcs.), 6 (4 pcs.), 7 (4 pcs.), 9 (5 pcs.), ∑28.


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