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Specification linked-list
enrich cell-heap , 
       list with
   functions 
      ls : ref × list → heap → bool;
   
   axioms 
      ls-base :  ⊦ ls(r, []) = (emp ∧ ⌜r = null⌝ );
      used for : s, ls;
       
      ls-rec :  ⊦ ls(r, a ' + x) = _∃ λ r0. r => a × r0 * ls(r0, x);
      used for : s, ls;
       
end enrich