모든 콘텐�?기사)�?저작권법의 보호�?받는 �? 무단전재, 복사, 배포 등을 금합니다. If a grammatical principle which is added to 서툴�?is actually a vowel �?and there is no other selection other than a vowel �?then that grammatical principle can't be additional to 서툴�? It really is incorrect s