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He studied architecture and worked at Ivan Michurin 's workshop until 1741 , later working for Ivan Korobov ( 1741 – 1743 ) .
 person: Ivan Michurin; person: Ivan
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: Ivan Michurin, Ivan 
Answer:
 person: Ivan Michurin; person: Ivan