상담 간편 전화상담 상품 자세�?보기 If a grammatical theory that is certainly additional to 서툴�?is a vowel �?and there's no other possibility in addition to a vowel �?then that grammatical basic principle cannot be included to 서툴�? 저작자 명시 필수 영리�?사용 불가 내용 변�?불가 저작�