Consider adding operations to the ADT dictionary to form the union and intersection of two given dictionaries. Each operation returns a new dictionary. The union should combine all of the entries in both dictionaries into a third dictionary. The intersection should be a dictionary of the entries common to both of the two dictionaries. Within each given dictionary, search keys are not repeated. However, an entry in one dictionary could have the same search key as an entry in the second dictionary. Propose and discuss ways to specify these two operations for this case.