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Some pen names have been used for long periods , even decades , without the author 's true identity being discovered , such as Elena Ferrante and Torsten Krol .
 Elena Ferrante, Torsten Krol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Elena Ferrante, Torsten Krol