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However , even as investors applauded Exxon Mobil 's new chief executive , Rex W. Tillerson , who succeeded Lee R. Raymond at the start of this year , Exxon Mobil 's results masked potentially weaker profits if oil and gas prices begin to decline .
 Rex W. Tillerson, Exxon Mobil; Rex W. Tillerson, Exxon Mobil
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 Rex W. Tillerson, Exxon Mobil; Rex W. Tillerson, Exxon Mobil