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Later he lectured alternately on " introduction to analysis " , probability theory ( succeeding Chebyshev , who had left the university in 1882 ) and the calculus of differences .
 person: Chebyshev
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Chebyshev 
Answer:
 person: Chebyshev