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Specification modification
data specification
   

   using key
, 
         address
, 
         node


   data types modification
               = contains(. .key : key) with .contains?
               | lookup(. .key : key) with .lookup?
               | store(. .key : key;. .adr : address) with .store?
               | remove(. .key : key) with .remove?
               ;

   variables  mod : modification;

   

   
end data specification