775
Boston College  's main campus in Chestnut Hill west of downtown Boston is and includes over 120 buildings set on a hilltop overlooking the  Chestnut Hill  Reservoir .
 city of headquarters: Boston College, Chestnut Hill
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: Boston College, Chestnut Hill