Sudoku #m687

Sudoku game, level: Medium #687. This Sudoku have 23 given numbers (clues)..
Structure: 1 (2 pcs.), 2 (2 pcs.), 3 (2 pcs.), 4 (2 pcs.), 7 (2 pcs.), 5 (3 pcs.), 8 (3 pcs.), 9 (3 pcs.), 6 (4 pcs.), ∑23.


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