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His father , Gary Hall Sr. , also competed in three Olympics as a swimmer ( 1968 , 1972 , and 1976 ) .
 person: Gary Hall Sr.
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Gary Hall Sr.