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Milan Horyna ( born January 9 , 1939 ) is a Czechoslovak slalom canoer who competed from the late 1950s to the early 1970s .
 Milan Horyna, 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:
 Milan Horyna, Czechoslovak