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The consistency of a theory such as ZFC cannot be proved within the theory itself , as shown by Gödel 's second incompleteness theorem .
 person: Gödel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Gödel