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Although the two men 's actions were classified by the media as psychopathy attributable to serial killer characteristics , researchers have debated whether their psychopathy meets this classification or that of spree killing .
 psychopathy
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:
 psychopathy