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Kallio made his debut in the 1910s under the name " Gus Kallio " ( some placed he was billed as " Gust Kallio " ) and began competing in the Welterweight division , a weight class with a top weight limit of .
 Kallio, Gus Kallio, Kallio
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kallio, Gus Kallio, Kallio