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In 1839 , he shared offices with Dr. Levi D. Boone , who would go on to become Mayor of Chicago in 1855 .
 Levi D. Boone
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Levi D. Boone