6491
Chao was not able to come back to Taiwan until 1987 when he was invited by then  Vice President   Lee Teng-hui  for a visit .
 title of person: Vice President, Lee Teng-hui
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:
 title of person: Vice President, Lee Teng-hui