Sudoku #x770

Sudoku game, level: Expert #770. This Sudoku have 27 given numbers (clues)..
Structure: 2 (2 pcs.), 6 (2 pcs.), 8 (2 pcs.), 3 (3 pcs.), 4 (3 pcs.), 5 (3 pcs.), 9 (3 pcs.), 1 (4 pcs.), 7 (5 pcs.), ∑27.


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