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Paranormal investigator Joe Nickell discovered many of the reported ghost activities were due to the activities of the late night clean up crew .
 person: Joe Nickell
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: Joe Nickell 
Answer:
 person: Joe Nickell