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Thereafter , he attended Yale University , where he received an M.A. in international relations in 1959 and a Ph.D. in the discipline in 1961 .
 organization: Yale University
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Yale University