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As an undergraduate at Indiana University , Struble studied with John Eaton , Bernhard Heiden and Juan Orrego-Salas , in addition to seminars with John Cage , Iannis Xenakis , George Crumb , Virgil Thomson , Aaron Copland , Donald Erb and others .
 Indiana University, Struble, Bernhard Heiden, Juan Orrego-Salas, John Cage, Iannis Xenakis, George Crumb, Virgil Thomson, Aaron Copland, Donald Erb
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Indiana University, Struble, Bernhard Heiden, Juan Orrego-Salas, John Cage, Iannis Xenakis, George Crumb, Virgil Thomson, Aaron Copland, Donald Erb