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But after considerable behind-the-scenes jockeying over his proposal in advance of a two-day summit meeting that opened here on Monday , Africa 's leaders opted instead to set up a committee that will recommend who should replace President Olusegun Obasanjo of Nigeria as the African Union 's chairman .
 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