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In the 1960 s , the hallmark of dialogue 's films were improvised blacks , absurd and František Vláčil humor and the occupation of non-actors .
 František Vláčil
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 František Vláčil