Specification list-setequal

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enrich
   list-set
with
   predicates 
       . ≡ . : List × List;
   
   variables 
       x : List;
       y : List;
       z : List;
       a : Elem;
       b : Elem;
       c : Elem;
   
   axioms 
      setequal-def: x ≡ y ↔ x ⊆ y ∧ y ⊆ x;
      used for: ls;
   
   
end enrich