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In July 1927 , the aging former heavyweight champion Jack Dempsey came from behind to defeat heavily favored Jack Sharkey by delivering several questionable punches that were deemed illegal .
 person: Jack Dempsey; person: Jack Sharkey
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Jack Dempsey; person: Jack Sharkey