17498
The annual pro-democracy march on the anniversary of Britain 's transfer of Hong Kong to China in 1997 drew 21,000 people according to organizers and 17,000 according to the police .
 location contains: China, Hong Kong; country of administrative divisions: China, Hong Kong; administrative division of country: Hong Kong, China
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: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 location contains: China, Hong Kong; country of administrative divisions: China, Hong Kong; administrative division of country: Hong Kong, China