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Alan Gordon is a Scottish-born Canadian historian ( born 1968 ) and author at the University of Guelph .
 person: Alan Gordon; organization: University of Guelph
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: Alan Gordon, University of Guelph 
Answer:
 person: Alan Gordon; organization: University of Guelph