6918
Obama  and Ayers first met at the first  Chicago  Annenberg Challenge board of directors meeting at noon on March 15 1995 at the headquarters of the Spencer Foundation on the 28th floor of the 900 North Michigan building in Chicago .
 cities of residence: Obama, Chicago
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:
 cities of residence: Obama, Chicago