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Saul Kripke believes that ' possible world ' is something of a misnomer – that the term ' possible world ' is just a useful way of visualizing the concept of possibility .
 Saul Kripke
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:
 Saul Kripke