Sudoku #h535

Sudoku game, level: Hard #535. This Sudoku have 28 given numbers (clues)..
Structure: 5 (1 pcs.), 4 (2 pcs.), 9 (2 pcs.), 6 (3 pcs.), 1 (4 pcs.), 2 (4 pcs.), 3 (4 pcs.), 7 (4 pcs.), 8 (4 pcs.), ∑28.


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