Sudoku #x54

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


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