Sudoku #x463

Sudoku game, level: Expert #463. This Sudoku have 27 given numbers (clues)..
Structure: 6 (2 pcs.), 4 (2 pcs.), 5 (2 pcs.), 2 (2 pcs.), 3 (3 pcs.), 9 (4 pcs.), 8 (4 pcs.), 7 (4 pcs.), 1 (4 pcs.), ∑27.


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