2958
To continue offshore exploration  China  established the China National Offshore Oil Corporation (  CNOOC  ) to assist foreign oil companies in exploring developing extracting and marketing China's oil .
 country of headquarters: China, CNOOC
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "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} 
Answer:
 country of headquarters: China, CNOOC