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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 .
 top members employees: BHP Billiton, Marius Kloppers
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:
 top members employees: BHP Billiton, Marius Kloppers