Sudoku #h503

Sudoku game, level: Hard #503. This Sudoku have 25 given numbers (clues)..
Structure: 3 (2 pcs.), 6 (2 pcs.), 7 (2 pcs.), 9 (2 pcs.), 1 (3 pcs.), 4 (3 pcs.), 5 (3 pcs.), 8 (3 pcs.), 2 (5 pcs.), ∑25.


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