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He received his Bachelor of Arts in political science ( with a minor in economics ) in 1980 , his Master of Arts in economics in 1987 , and his Ph.D. in political science , with a focus on American national government and environmental security issues in 1996 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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