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A major theme was the nature of heroism , contrasting the often dark and conflicted modern-day heroes with memories of " lighter " and ostensibly more noble and collegial heroes of American comic books ' earlier days .
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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:
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