Specification implementation

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enrich
   dllist
with
   

   
   
   
   
   procedures remove ref : heap nonfunctional ;
              insert ref : heap nonfunctional ;
   

   

   

   

   declaration remove
               : remove(r; H){let prev = H[r].left, next = H[r].right in {H := H[next, H[next].left:= prev]; H := H[prev, H[prev].right:= next]}}
               ;
               inser : insert(r; H){let prev = H[r].left, next = H[r].right in {H := H[next, H[next].left:= r]; H := H[prev, H[prev].right:= r]}};
end enrich