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			18% is what is typically added to parties of 6 or more.  the reasoning is that the larger the party, the more likely that someone will stiff the waitstaff(intentionally, or just a mixup in the confusion) , also that additional waitstaff may be needed to help shoulder the load.
		 
		
		
		
		
		
		
			
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				Getting knocked down is no sin, it's not getting back up that's the sin
			 
		
		
		
		
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