Sudoku #h54

Sudoku game, level: Hard #54. This Sudoku have 27 given numbers (clues)..
Structure: 1 (2 pcs.), 5 (2 pcs.), 6 (2 pcs.), 7 (2 pcs.), 2 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 3 (4 pcs.), 4 (6 pcs.), ∑27.


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