Sudoku #x572

Sudoku game, level: Expert #572. This Sudoku have 28 given numbers (clues)..
Structure: 9 (1 pcs.), 4 (2 pcs.), 6 (3 pcs.), 1 (3 pcs.), 8 (3 pcs.), 7 (4 pcs.), 5 (4 pcs.), 2 (4 pcs.), 3 (4 pcs.), ∑28.


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