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He bettered his personal bests by nearly 0.3 seconds on the 500 metres and 0.4 on the 1000 , but still missed the medal in the 500 metres by 0.01 seconds , finishing fourth after a tie with Tucker Fredricks was split on the time in the second race .
 Tucker Fredricks
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tucker Fredricks