46663
Chang argues , based partly on speculation , that China either helped North Korea build atomic bombs or had full knowledge of efforts by the Pakistani nuclear scientist A. Q. Khan to assist Pyongyang .
 North Korea, Pyongyang; Pyongyang, North Korea; North Korea, Pyongyang; North Korea, Pyongyang
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 North Korea, Pyongyang; Pyongyang, North Korea; North Korea, Pyongyang; North Korea, Pyongyang