Specification list+set

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enrich
   list-prefixn, 
   set-union

with
   

   
   
   functions  . .toSet : list → set;
   
   
   
   
   

   

   axioms toSet-ext :  ⊦ a ∈ x.toSet ↔ a ∈ x;
          used for: s, ls;

   

   
end enrich