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It is used by local people as an outdoor classroom for studies about natural science , local history , agriculture , and the arts ; and as a recreational area providing views of the Sandhills prairie , meadows , cottonwoods , oxbow wetlands , lowland tall grass , oak forest and the loess hills by Beaver Creek .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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