Sudoku #x506

Sudoku game, level: Expert #506. This Sudoku have 27 given numbers (clues)..
Structure: 5 (0 pcs.), 3 (1 pcs.), 4 (3 pcs.), 7 (3 pcs.), 9 (3 pcs.), 2 (4 pcs.), 6 (4 pcs.), 8 (4 pcs.), 1 (5 pcs.), ∑27.


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