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Jack Spigot ( 4 May 1818 – June 1843 ) was a British Thoroughbred racehorse that won the 1821 St. Leger Stakes and was a sire in the early 19th century .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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