| Author | 
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	   Topic: subgroup question | 
   
  
	Dave 
	   
	  Replies: 2 
	  Views: 18882 
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	 Forum: Other puzzles   Posted: Fri Oct 17, 2014 9:33 pm   Subject: subgroup question | 
   
  
	| Hi, I've been struggling with this for several days.  I am told that "the column contains a sub-group of 1,2,3 so 1,2,3 may be eliminated from the top 2 squares.  Where and why is the subgroup?   ... | 
   
  
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