15638
Men's Greco-Roman 66 kg competition at the 2008 Summer Olympics in Beijing  China  was held on August 13 at the  China Agricultural University  Gymnasium .
 country of headquarters: China, China Agricultural University
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:
 country of headquarters: China, China Agricultural University