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State broadcaster ARD/NDR was revealed to have approached Stefan Raab and private broadcaster ProSieben to work alongside them in preparing for the 2010 Contest with a view of creating a possible winning song that would be sung by someone else .
 person: Stefan Raab
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: Stefan Raab 
Answer:
 person: Stefan Raab