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Specification olist-sort
enrich
   olist
with
   functions 
       sort : list(tord) → list(tord);
   
   variables 
       x : list(tord);
       y : list(tord);
       z : list(tord);
       a : tord;
       b : tord;
       c : tord;
   
   
   axioms 
      Ordered: ordered≤(sort(x));
      
      Perm: perm(x, sort(x));
   
   
end enrich