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The middle commentaries were probably written in response to his patron caliph Abu Yaqub Yusuf 's complaints about the difficulty of understanding Aristotle 's original texts and to help others in a similar position .
 Abu Yaqub Yusuf, Aristotle
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Abu Yaqub Yusuf, Aristotle