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Roald Sagdeev and Boris Chirikov helped him form an interest in the theory of dynamical chaos .
 person: Roald Sagdeev; person: Boris Chirikov
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: Roald Sagdeev, Boris Chirikov 
Answer:
 person: Roald Sagdeev; person: Boris Chirikov