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Leon Festinger found that self-confidence in an individual 's ability may only rise or fall where that individual is able to compare themselves to others who are roughly similar in a competitive environment .
 person: Leon Festinger
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: Leon Festinger