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Vladimír Páral ( born August 10 , 1932 ) is Czech fiction writer , one of the most successful Czech contemporary writers .
 Vladimír Páral, Czech, Czech
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vladimír Páral, Czech, Czech