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In 1969 – 70 , Yoichiro Nambu , Holger Bech Nielsen , and Leonard Susskind recognized that the theory could be given a description in space and time in terms of strings .
 person: Yoichiro Nambu; person: Holger Bech Nielsen; person: Leonard Susskind
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: Yoichiro Nambu, Holger Bech Nielsen, Leonard Susskind 
Answer:
 person: Yoichiro Nambu; person: Holger Bech Nielsen; person: Leonard Susskind