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Philosopher Nick Bostrom has noted a possible trade-off , namely that some existential risks might be mitigated by a powerful permanent world government , but that such power could in turn enhance any existential risks associated with permanent dictatorship .
 Nick Bostrom
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nick Bostrom