Sudoku #x309

Sudoku game, level: Expert #309. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 8 (2 pcs.), 9 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 4 (4 pcs.), 6 (4 pcs.), 1 (5 pcs.), ∑28.


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