Re: Ideas....
			 
             
			
		
		
		
		i think matryx in his original post meant something like this 
 
you can't research tech 1 when you have already researched tech 2.  
 
this way you could add more contradictory techs, or am i the one who is missing the point? 
can't think of an example now...maybe later 
 
 
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2b| |!2b? 
		
	
		
		
		
		
		
		
			
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