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Specification reachable
enrich rtc-ref , 
       refset with
   functions 
      reach : ref × (ref × ref → bool) → refset;
   variables 
      rrp : ref × ref → bool; 
   
   axioms 
      reachset :  ⊦ r1 ∈ reach(r0, rrp) ↔ (rrp ^*)(r0, r1);
      used for : s, ls;
       
end enrich