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He was sent to the 2004 Tattersalls Ireland Derby Sale as a four-year-old but this proved fruitless when one of the vets present said that the young store could benefit from a hobday operation on his windpipe .
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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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