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On February 6 , 1937 Gaona defeated Black Guzmán to win the vacant Mexican National Middleweight Championship .
 Gaona, Black Guzmán, Mexican
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gaona, Black Guzmán, Mexican