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Seoul Subway Line 3 ( dubbed The Orange Line ) of the  Seoul Metropolitan Subway  is a subway which connects Goyang northwestern  Seoul  to the city center Gangnam and southeastern Seoul .
 city of headquarters: Seoul Metropolitan Subway, Seoul
Given a phrase that describes the relationship between two words, extract the words and the lexical relationship between them. The output format should be "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
Answer:
 city of headquarters: Seoul Metropolitan Subway, Seoul