| Author | 
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	   Topic: Has to be | 
   
  
	cafoster 
	   
	  Replies: 1 
	  Views: 136135 
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	 Forum: Solving techniques, and terminology   Posted: Thu Jan 17, 2013 5:17 pm   Subject: Has to be | 
   
  
	I use a method of notation and solving I think is called "has to be".
 Rather than writing in all the possibilities I first put in just the "has to be " notations.   That is number ... | 
   
  
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