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In 1812 , Ludwig van Beethoven conceived the idea of writing an opera about Attila and approached August von Kotzebue to write the libretto .
 person: Ludwig van Beethoven; person: Attila; person: August von Kotzebue
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: Ludwig van Beethoven, Attila, August von Kotzebue 
Answer:
 person: Ludwig van Beethoven; person: Attila; person: August von Kotzebue