13461
At the end of 2006 combined market capitalization of both  Ho Chi Minh  City Securities Trading Center and Hanoi Securities Trading Center is 14 billion US dollars or 22.7 % GDP of  Vietnam  .
 country of headquarters: Ho Chi Minh, Vietnam
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  Ho Chi Minh, Vietnam 
Answer:
 country of headquarters: Ho Chi Minh, Vietnam