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There he won a gold medal in the men 's 800 metres - T12 event , finished fourth in the men 's 400 metres - T12 event and finished sixth in the men 's 1500 metres - T13 event .
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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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