Specification data-refinement

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enrich
   ordered-set, 
   search-tree
with
   

   
   
   functions  . .set : tree → set;
             comment: abstraction function from trees to sets;
   
   
   

   

   axioms in-set :  ⊦ a ∈ t.set ↔ a ∈ t;
          used for: s, ls;

   

   
end enrich