47721
Still , a report on the future of sub-Saharan Africa published by the National Intelligence Council , a government think tank for the United States intelligence services , after a conference on the topic last March , identified the collapse of Nigeria as the most important risk facing Africa today . ''
 location contains: Africa, Nigeria
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:  Africa, Nigeria 
Answer:
 location contains: Africa, Nigeria