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While finishing his degree at OSU , Strong began working at the Oklahoma Water Resources Board , where he worked as an environmental scientist for several years .
 person: Strong; location: Oklahoma
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: Strong, Oklahoma 
Answer:
 person: Strong; location: Oklahoma