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They point out that , in 2004 , the annual production of antiprotons at CERN was several picograms at a cost of $ 20 million .
 location: CERN
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: CERN 
Answer:
 location: CERN