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Kallio 's wrestling career peaked in the 1920s and 1930s where he was known as the " King of the Welterweights " and later on " King of the Middleweights " as he held multiple world titles in those two weight divisions .
 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