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He shared 1st with C.M. Portela at Buenos Aires 1917 , took 2nd , behind L. Carranza , at Buenos Aires 1920 , tied for 2nd-4th at Montevideo ( Carrasco ) 1921/22 ( South American Championship , Roberto Grau won ) , and took 5th at Buenos Aires 1922 ( Pentagonal , Benito Villegas won ) .
 Buenos Aires, Buenos Aires, Roberto Grau, Buenos Aires, Benito Villegas
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Buenos Aires, Buenos Aires, Roberto Grau, Buenos Aires, Benito Villegas