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Elmo originally invested $ 40,000 of his own money to produce the original album and music video for " Grandma ... " and in return , he 's become " a millionaire five times over " .
 Elmo
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Elmo