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The series was critically panned for the lack of long-term effects on continuity and retroactively changing the nature of the powers of various superheroes by suggesting that all superpowers were actually manifestations of the Source in the form of a Grand Unified Theory .
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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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