Sudoku #x664

Sudoku game, level: Expert #664. This Sudoku have 28 given numbers (clues)..
Structure: 8 (1 pcs.), 3 (2 pcs.), 4 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 6 (3 pcs.), 9 (4 pcs.), 5 (5 pcs.), 7 (5 pcs.), ∑28.


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