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Ancient The city of Ujjain ( also known as Avanti ) arose as a major center in the second wave of Indian urbanization in the sixth century BC , and served as the chief city of the kingdom of Malwa or Avanti .
 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:
 Ujjain