Dartmoor Medical Associates maintains two patient files- one for the Lakewood office and one for the Hanover office. Each record contains the name, address, city, state, and zip code of a patient, with the files maintained in zip code order. Design the logic that merges the two files to produce one combined name-and-address file, which the office staff can use for addressing mailings of the pracice's monthly Healthy Lifestyles newsletter.