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The  OPEC  is a cartel of 12 developing countries made up of Algeria Angola  Ecuador  Iran Iraq Kuwait Libya Nigeria Qatar Saudi Arabia the United Arab Emirates and Venezuela .
 members: OPEC, Ecuador
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  OPEC, Ecuador 
Answer:
 members: OPEC, Ecuador