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Random sudoku puzzle

  6       1      
              5  
      2   7      
    2       5 3  
    5            
                 
      4          
                 
        9       4
Showing puzzle number: 17167
Puzzletype: Optimal Sudoku
Startnumbers: 12
Difficulty: Very hard (0)
Solution methods: SiSo SC SB FI
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