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He then became scientific assistant at the Insurance Mathematical Seminar at the University Oslo in 1948 , where the education of actuararies was organised , after which he spent stipend years in the USA and completed his PhD there in 1952 .
 organization: Oslo
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: Oslo 
Answer:
 organization: Oslo