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Sudoku puzzle

      6     4    
7         3 6    
        9 1   8  
                 
  5   1 8       3
      3   6   4 5
  4   2       6  
9   3            
  2         1    
Showing puzzle number: 2155141
Puzzletype: Optimal Sudoku
Startnumbers: 23
Difficulty: Impossible (4878)
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