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He was also the owner of the National Basketball Association 's Boston Celtics and San Diego Clippers .
 National Basketball Association, Boston Celtics, San Diego Clippers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 National Basketball Association, Boston Celtics, San Diego Clippers