Re: Stealth Armor
			 
             
			
		
		
		
		Andrés: 
I'm pretty sure that "energy stream weapons" and "Energy pulse weapons" do not require physics 1.  I doubt that "Sensors" requires physics 1, but I'm not completely sure. 
 
Other than that, very nice.  It would convert very naturally into a Lines & Circles graph, plus have the advantage of showing the multiple prerequisites neatly. 
		
	
		
		
		
		
		
		
			
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