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Alexander Slafkovský ( born March 11 , 1983 in Liptovský Mikuláš , Czechoslovakia ) is a Slovak slalom canoer who has competed since the late 1990s .
 Alexander Slafkovský, Liptovský Mikuláš, Czechoslovakia, Slovak
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
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Answer:
 Alexander Slafkovský, Liptovský Mikuláš, Czechoslovakia, Slovak