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Thus Xenophon 's Oeconomicus ( see also Memorabilia ii .4 ) contains a eulogy of agriculture and its beneficial ethical effects , and much information is to be found in the writings of Aristotle and his pupil Theophrastus .
 Xenophon, Aristotle, Theophrastus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Xenophon, Aristotle, Theophrastus