25894
For the family of Captain Cope , this would be one of the first pieces of evidence about his fate since his F-86F Sabre jet was reported missing on Sept. 16 , 1952 , after a fierce dogfight with North Korean MIG fighters over the Yalu River , which separates China from North Korea .
 location contains: North Korea, Yalu River
Given options, please tell me the relationships of all the listed entity pairs.Output format is "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} 
 Entity Pairs:  North Korea, Yalu River 
Answer:
 location contains: North Korea, Yalu River