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Prettyman won a record eight varsity letter s at the University of Michigan , playing for the school 's football team from 1882 to 1886 and 1888 to 1890 .
 Prettyman, University of Michigan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Prettyman, University of Michigan