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Antonín Brabec ( born April 2 , 1946 ) is a Czechoslovak slalom canoer who competed in the early to mid-1970s .
 Antonín Brabec, Czechoslovak
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Antonín Brabec, Czechoslovak