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The Kingdom of Derge was an important kingdom in Eastern Tibet , a center of industry , religion and politics , with the seat of its kingdom in the town of Derge .
 Derge, Derge
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Derge, Derge