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Australia's proposed 40 percent tax on resources profits could not only drive investment overseas but impact expansion at  BHP Billiton  's Olympic Dam mine chief executive  Marius Kloppers  said Sunday .
 BHP Billiton, Marius Kloppers
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; 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:
 BHP Billiton, Marius Kloppers