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Greater attention was given to the subject in the Alexandrian period ; a long list of names is given by Varro and Columella , amongst them Hiero II and Attalus III Philometor .
 Varro, Columella, Hiero II, Attalus III
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Varro, Columella, Hiero II, Attalus III