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David C. Williams is the Inspector General ( IG ) for the U.S. Postal Service , in the United States Postal Service Office of Inspector General .
 organization: U.S. Postal Service; organization: Postal Service
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: U.S. Postal Service, Postal Service 
Answer:
 organization: U.S. Postal Service; organization: Postal Service