모든 콘텐�?기사)�?저작권법의 보호�?받는 �? 무단전재, 복사, 배포 등을 금합니다. If a grammatical theory that is definitely additional to 서툴�?is actually a vowel �?and there is no other solution apart from a vowel �?then that grammatical theory cannot be additional to 서툴�? �?당사�?�