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Pyat Dney , Pyat Nochei ; ) is a 1961 joint Soviet - East German film , directed by Lev Arnshtam and Heinz Thiel .
 Lev Arnshtam, Heinz Thiel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Lev Arnshtam, Heinz Thiel