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Not to be confused with Dongdaemun , the old east gate of Seoul Taedong Gate is the eastern gate of the inner castle of the walled city of Pyongyang ( Pyongyang Castle ) , and one of the National Treasures of North Korea .
 Seoul, Pyongyang, Pyongyang
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Seoul, Pyongyang, Pyongyang