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Campbell R. Bridges ( 1937 – 11 August 2009 ) was a Scottish gemologist .
 person: Campbell R. Bridges
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: Campbell R. Bridges 
Answer:
 person: Campbell R. Bridges