This is probably painfully obvious to most... How do I create a Koza list function? 
Koza had Listx, with x being the arity of the function. I'll use this for testing only 
and at this time it will be fed by ERC terminals as Sean previously suggested.

I'll create 3 list functions, List16, List17, List18, and an ERC with an integer range 
of 1-26, to create trees which return either 16, 17, or 18 ints in a list. That list 
will be checked for conflict constraints, ie if 6 then not 7, producing 32 unique 
individuals. I realise Koza needed the Listx function because he was using Lisp, 
I'm just wondering how this is normally done.

-- ray