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The remaining six independent cities are called " gwangyeok-si " ( 광역시 ; literally , large city ) whose names are : Busan , Daegu , Daejeon , Incheon , Gwangju , and Ulsan .
 Busan, Daegu, Daejeon, Incheon, Gwangju, Ulsan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Busan, Daegu, Daejeon, Incheon, Gwangju, Ulsan