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The film was originally titled “ Duck Farm No. 13 ” , but was changed to appeal to younger audiences ; it was filmed primarily in McGregor , Iowa and premiered August 29 , 2009 at the Landlocked Film Festival .
 McGregor , Iowa
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 McGregor , Iowa