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Sean Mackey , OBE ( 1918 – 1997 ) was an Irish engineering professor .
 person: Sean Mackey
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: Sean Mackey 
Answer:
 person: Sean Mackey