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Stratton was educated at Bowdoin College in his hometown and at Columbia University 's Graduate School , Stratton graduated BS from Bowdoin in the class of 1935 and AM from Columbia .
 Stratton, Bowdoin College, Columbia University, Stratton, Bowdoin, Columbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stratton, Bowdoin College, Columbia University, Stratton, Bowdoin, Columbia