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Williams StationSan Francisco Municipal Railway Map 2007 access date July 10 2008 is a light rail station of the  San Francisco Municipal Railway  's Muni Metro system located in the median of Third Street at Williams and Van Dyke Avenues in Bayview  San Francisco  California .
 city of headquarters: San Francisco Municipal Railway, San Francisco
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: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: San Francisco Municipal Railway, San Francisco