19569
 On the Maryland side , the visitors ' center is in the historic Great Falls Tavern , 11710 MacArthur Boulevard , in Potomac , 301-767-3714 ; there is also a visitor 's center on the Virginia side , 703-285-2965 . 
 location contains: Maryland, Potomac
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 location contains: Maryland, Potomac