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Jaroslav Pollert ( born August 16 , 1943 ) is a Czechoslovak slalom canoer who competed in the 1960s and 1970s .
 Jaroslav Pollert, 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:
 Jaroslav Pollert, Czechoslovak