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In four games in the 2010 preseason , the NFL experimented with an eighth official , a " deep judge ( DJ ) " , in the defensive backfield opposite the back judge .
 organization: NFL
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: NFL 
Answer:
 organization: NFL