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He won four medals in the C-2 event at the ICF Canoe Slalom World Championships with two golds ( 1957 , 1959 ) , a silver ( 1955 ) , and a bronze ( 1961 ) .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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