Alan, thank you very much for your 'EDIT', it is most interesting. 
 A better understanding of how they were thinking at the time - which logic they used - is very much asked for, but it is likely not easy to find.
		 
		
		
		
		
		
		
		
		
			
				  
				
					
						Last edited by Jens Nordlunde; 11th October 2018 at 05:32 PM.
					
					
				
			
		
		
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