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The transition also sent the pair into another universe , which came to be known as the Negation ; Charon took command of this universe , building it into a massive intergalactic empire , and imprisoning the slightly less powerful Appolyon .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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