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Klein also worked on the characters Miss America ( inking the premiere issue in 1944 ) , the Young Allies , the Black Marvel , the Golden Age Black Widow , the Defender , and , under the pseudonym Nick Karlton , the Challenger .
 Klein, Marvel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Klein, Marvel