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Born in Hamilton , Ontario , Canada , Andrew Miller studied at Exeter College before graduating in 1880 from Harvard University where he was a classmate of Theodore Roosevelt .
 Hamilton , Ontario, Canada, Andrew Miller, Harvard University, Theodore Roosevelt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hamilton , Ontario, Canada, Andrew Miller, Harvard University, Theodore Roosevelt