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				11-20-2003, 07:55 PM
			
			
			
		  
		
	
                
            	
		
		
		Their unknown yes, but they can be estimated.  And whatever the estiates are the equation still simply states that there is probably a good chance that we are not alone.  Therefore the equation is still a valid tool in the scientific cuommunity. 
		
	
		
		
		
		
		
	
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