Sudoku #m81

Sudoku game, level: Medium #81. This Sudoku have 27 given numbers (clues)..
Structure: 8 (2 pcs.), 1 (2 pcs.), 5 (2 pcs.), 4 (3 pcs.), 9 (3 pcs.), 2 (3 pcs.), 6 (4 pcs.), 3 (4 pcs.), 7 (4 pcs.), ∑27.


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9
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7
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7
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4
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