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 The presence of dozens of billionaires , however eye-catching , is of less moment than the absence of millions of small and medium businesses , '' Stephen Kotkin , director of Princeton University 's Russian studies program , said in an e-mail interview . 
 Stephen Kotkin, Princeton University
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 Stephen Kotkin, Princeton University