Sudoku #m841

Sudoku game, level: Medium #841. This Sudoku have 23 given numbers (clues)..
Structure: 3 (1 pcs.), 4 (2 pcs.), 7 (2 pcs.), 8 (2 pcs.), 1 (3 pcs.), 2 (3 pcs.), 6 (3 pcs.), 9 (3 pcs.), 5 (4 pcs.), ∑23.


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6
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9
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5
8
3
7
4
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