Sudoku #x812

Sudoku game, level: Expert #812. This Sudoku have 28 given numbers (clues)..
Structure: 2 (1 pcs.), 3 (2 pcs.), 9 (3 pcs.), 6 (3 pcs.), 5 (3 pcs.), 1 (3 pcs.), 8 (4 pcs.), 7 (4 pcs.), 4 (5 pcs.), ∑28.


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