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Lukoil  bought 42.5 million or 5 percent of its own American Depository Receipts as part of a strategy to raise shareholder returns through a share buyback from the market the  Moscow  - based company said in a statement on Sunday .
 city of headquarters: Lukoil, Moscow
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:
 city of headquarters: Lukoil, Moscow