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The Olson Nature Preserve is a nature preserve in Boone County , in east-central Nebraska .
 location: Boone County; location: Nebraska
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: Boone County, Nebraska 
Answer:
 location: Boone County; location: Nebraska