1619
He said the driver spoke in perfect Pekingese and admitted that he was from Beijing that he had been briefed by the Taiwan Research Institute ( affiliated with the  People's Republic of China  's National Security Ministry ) that he had a master's degree in hydraulic dynamics from  Tsinghua University  and that he was in Taiwan to ' serve the broad masses by comparing the strengths and weaknesses between the capitalist and socialist systems .
 country of headquarters: People's Republic of China, Tsinghua 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: People's Republic of China, Tsinghua University