369114
Unlike lines 1 to 3 of Busan Subway the trains are driverless and run with pneumatic tires on concrete track ( Roll way ) between two guide bar s. Line 3 and Line 4 While Busan Subway Line 3 was being planned , the planners thought about making what is now Busan Subway Line 4 the 2nd phase of Busan Subway Line 3 .
 Busan, Busan, Busan, Busan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Busan, Busan, Busan, Busan