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It was formed on January 1 , 2012 through a merger of the former Judenburg District and Knittelfeld District .
 Judenburg District, Knittelfeld District
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Judenburg District, Knittelfeld District