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 Op-Ed Contributor Thomas Homer-Dixon is director of the Trudeau Center for Peace and Conflict Studies at the University of Toronto . 
 Thomas Homer-Dixon, University of Toronto
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:
 Thomas Homer-Dixon, University of Toronto