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Kalidasa , Aryabhata and Varahamihira were all based in Ujjain , which emerged as a major centre of learning , especially in astronomy and mathematics .
 Aryabhata, Varahamihira, Ujjain
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Aryabhata, Varahamihira, Ujjain