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He became the British flat racing Champion Jockey in 1930 , making him one of only three jockeys to interrupt Gordon Richards ' three decade run as champion and won two Derbies on Cameronian in 1931 and Bahram in 1935 .
 person: Gordon Richards
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: Gordon Richards 
Answer:
 person: Gordon Richards