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Umbro sued him for breach of contract for knowingly wearing Reebok branded boots in contravention of the deal , and deliberately " blacking out " their logo on his boots in protest .
 Umbro, Reebok
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Umbro, Reebok