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OPEC 's acting secretary general , Mohammed Barkindo , who is also a senior Nigerian official , told the energy publication Platts that he had met with Saudi Arabia 's oil minister this week in Riyadh and that Saudi Arabia was already cutting its production as part of the informal agreement .
 country of capital: Saudi Arabia, Riyadh; country of capital: Saudi Arabia, Riyadh; location contains: Saudi Arabia, Riyadh; location contains: Saudi Arabia, Riyadh
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:  Saudi Arabia, Riyadh; Saudi Arabia, Riyadh; Saudi Arabia, Riyadh; Saudi Arabia, Riyadh 
Answer:
 country of capital: Saudi Arabia, Riyadh; country of capital: Saudi Arabia, Riyadh; location contains: Saudi Arabia, Riyadh; location contains: Saudi Arabia, Riyadh