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Kevin Eastman ( born April 7 , 1955 ) is an American basketball coach and current assistant to head coach Doc Rivers of the Boston Celtics of the NBA .
 Kevin Eastman, American, Doc Rivers, Boston Celtics, NBA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kevin Eastman, American, Doc Rivers, Boston Celtics, NBA