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Many environmental historians consider the split between John Muir and Gifford Pinchot .
 person: John Muir; person: Gifford Pinchot
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: John Muir, Gifford Pinchot 
Answer:
 person: John Muir; person: Gifford Pinchot