Sudoku #b18

Sudoku game, level: Beginner #18. This Sudoku have 31 given numbers (clues)..
Structure: 1 (1 pcs.), 8 (3 pcs.), 5 (3 pcs.), 2 (4 pcs.), 9 (4 pcs.), 7 (4 pcs.), 6 (4 pcs.), 3 (4 pcs.), 4 (4 pcs.), ∑31.


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9
5
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9
7
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7
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5
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