Sudoku #x489

Sudoku game, level: Expert #489. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 5 (1 pcs.), 6 (2 pcs.), 1 (3 pcs.), 9 (3 pcs.), 3 (4 pcs.), 7 (4 pcs.), 4 (5 pcs.), 8 (5 pcs.), ∑28.


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