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Colonel Richard Gridley became General George Washington 's first chief engineer .
 person: Richard Gridley; person: George Washington
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: Richard Gridley, George Washington 
Answer:
 person: Richard Gridley; person: George Washington