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				A pedantic reply
			 
			 
			
		
		
		
			
			The rule doesn't mention timing, just that "the same color must be worn by teammates."  So if A1 wears a blue headband in the first half and A2 wears a white headband in the second half, then we have teammates that are wearing different colored headbands, and so are in violation of the rule.  Does that fly?
		 
		
		
		
		
		
		
		
		
	
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