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Hudeček was the pupil of this great master from 1970 to Oistrach 's death in 1974 .
 person: Hudeček; person: Oistrach
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: Hudeček, Oistrach 
Answer:
 person: Hudeček; person: Oistrach