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Sudoku puzzles disjoint groups (Su Doku)

My database includes 41726 puzzles for the moment and I'm constantly generating more.

Rules: Fill in the grid so that every row, every column, and every 2x4 box contains the digits 1 through 8. The cells with the same color must also contain the digits 1 through 8. There is only 1 solution for each puzzle.

For more information check out Wikipedia.

157700 puzzles downloaded.

        1      
    1   7   4  
      1     2  
      2 3      
      6 8      
  3     4      
  2   7   4    
      8        
Showing puzzle number: 7681
Puzzletype: Symmetrical Sudoku
Startnumbers: 16
Difficulty: Very easy (0)
Solution methods: SiSo SC
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