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The first part of his monastic life was spent in the Barabar Caves in Bihar , hollowed out of single granite boulders bearing the inscriptions of Emperor Ashoka and very far removed from human habitation .
 Bihar, Ashoka
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Bihar, Ashoka