의료보험 국민건강보험공단 대구수성지�?주소 전화번호 팩스번호 주차 수성구 If a grammatical principle that's additional to 서툴�?is really a vowel �?and there's no other option in addition to a vowel �?then that grammatical theory can't be extra to 서툴�? Any grammatical basic principle where There's a decision of whether a vowel Successfully Submitted (Awaiting Approval)