Sudoku #x410

Sudoku game, level: Expert #410. This Sudoku have 25 given numbers (clues)..
Structure: 4 (1 pcs.), 7 (2 pcs.), 3 (2 pcs.), 9 (2 pcs.), 8 (3 pcs.), 5 (3 pcs.), 2 (4 pcs.), 1 (4 pcs.), 6 (4 pcs.), ∑25.


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