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WPP Group Battles Its Own Unit in Italy An investigation by the WPP Group into its own operations in Italy is pitting its pugnacious chief executive , Sir Martin Sorrell , against an equally aggressive Italian businessman and casting light on a disorderly corner of Sir Martin 's normally tightly controlled empire .
 Martin Sorrell, WPP Group
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:
 Martin Sorrell, WPP Group