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Keogh wrote two books , This Is Nixon in 1956 , and President Nixon and the Press in 1972 .
 person: Keogh; person: Nixon; person: Nixon
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: Keogh, Nixon, Nixon 
Answer:
 person: Keogh; person: Nixon; person: Nixon