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		 Never look a gift horse in the mouth. 
 
The easiest way to determine a horse's age is to look at its teeth.  It was considered rude to try to find out the age of a horse recieved as a gift, it made the recipient look like he thought the giver would give him a cheap gift.  Looking a gift horse in the mouth was a sure way to make it look like you expected more than what you were given. 
		
		
		
		
		
		
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