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The Energy Studies Institute ( ESI ) is an independent research institute within the National University of Singapore .
 organization: Energy Studies; organization: National University of Singapore
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: Energy Studies, National University of Singapore 
Answer:
 organization: Energy Studies; organization: National University of Singapore