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He was an early investor in Berkshire Hathaway , Warren Buffett 's holding company , and served on Citigroup 's board .
 company major shareholders: Berkshire Hathaway, Warren Buffett; company shareholder among major shareholders: Warren Buffett, Berkshire Hathaway; person of company: Warren Buffett, Berkshire Hathaway
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: 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} 
 Entity Pairs:  Berkshire Hathaway, Warren Buffett; Warren Buffett, Berkshire Hathaway; Warren Buffett, Berkshire Hathaway 
Answer:
 company major shareholders: Berkshire Hathaway, Warren Buffett; company shareholder among major shareholders: Warren Buffett, Berkshire Hathaway; person of company: Warren Buffett, Berkshire Hathaway