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He earned his candidate degree in 1961 ( Andrey Kolmogorov was his advisor ) and a doctoral degree in 1967 for his work " On statistical sequential analysis " .
 Andrey Kolmogorov
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Andrey Kolmogorov