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Biography Born Don D. Robey in Houston , Texas , Robey 's entrepreneur ial spirit developed while growing up around Houston 's black business community , where he began as a professional gambler , then a taxicab business manager .
 Don, Robey, Houston, Texas, Robey, Houston
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Don, Robey, Houston, Texas, Robey, Houston