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The field of recursion theory , meanwhile , categorizes " undecidable " decision problems by Turing degree , which is a measure of the noncomputability inherent in any solution .
 person: Turing
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: Turing