Canadian Interpretation
			 
			 
			
		
		
		
			
			To call holding on D there has to be some form of advantage gained.  An example would be to allow another D player through the line unblocked.  If the tackle's job was to block the end and all the end did was grab the tackle then I have nothing since the tackle should be pleased that he accomplished his goal.
		 
		
		
		
		
		
		
		
		
	
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