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Whitman began his career at MTV Networks , working primarily at Nickelodeon and MTV for eight years , with much of his work focused on live television award shows and concert shows .
 Whitman, MTV Networks, Nickelodeon, MTV
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Whitman, MTV Networks, Nickelodeon, MTV