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Matthew Burton Brown ( born January 10 , 1981 ) is an American mixed martial artist currently signed to the Ultimate Fighting Championship in the welterweight division .
 Matthew, Brown, American, Ultimate Fighting Championship, welterweight
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Matthew, Brown, American, Ultimate Fighting Championship, welterweight