Sudoku #x145

Sudoku game, level: Expert #145. This Sudoku have 27 given numbers (clues)..
Structure: 8 (1 pcs.), 2 (2 pcs.), 7 (3 pcs.), 9 (3 pcs.), 6 (3 pcs.), 5 (3 pcs.), 3 (3 pcs.), 1 (4 pcs.), 4 (5 pcs.), ∑27.


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