Sudoku #h507

Sudoku game, level: Hard #507. This Sudoku have 27 given numbers (clues)..
Structure: 7 (2 pcs.), 8 (2 pcs.), 9 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 1 (4 pcs.), 2 (5 pcs.), ∑27.


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