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He became the vice-president of the National Union of Students , and visited the Soviet Union as a guest of state .
 organization: National Union of Students; location: Soviet Union
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: National Union of Students, Soviet Union 
Answer:
 organization: National Union of Students; location: Soviet Union