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Another theory is provided by Peter M. Sacks , who argues that the language of the play is marked by " an artificial and heavily emblematic style , and above all a revoltingly grotesque series of horrors which seem to have little function but to ironise man 's inadequate expressions of pain and loss " .
 Peter M. Sacks
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:
 Peter M. Sacks