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Avicenna argued that the impossible being is that which cannot exist , while the contingent in itself ( " mumkin bi-dhatihi " ) has the potentiality to be or not to be without entailing a contradiction .
 Avicenna
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Avicenna