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Alfredo Barrera Vázquez ( 1900 — December 28 , 1980 ) was a Mexican anthropologist , linguist , academic and Mayanist scholar .
 Alfredo Barrera, 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:
 Alfredo Barrera, Mexican