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He estimated that had Usain Bolt not slowed down near the end of the 100 m dash ( which he still won in record time ) , he could have set a time of 9.55 seconds .
 Usain Bolt
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Usain Bolt