4741
He said that Sergey Brin , one of Google 's founders and a mathematician by training , had proved that this breakdown was optimal .
 company major shareholders: Google, Sergey Brin; company shareholder among major shareholders: Sergey Brin, Google; person of company: Sergey Brin, Google; company founders: Google, Sergey Brin
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:  Google, Sergey Brin; Sergey Brin, Google; Sergey Brin, Google; Google, Sergey Brin 
Answer:
 company major shareholders: Google, Sergey Brin; company shareholder among major shareholders: Sergey Brin, Google; person of company: Sergey Brin, Google; company founders: Google, Sergey Brin