상담 간편 전화상담 상품 자세�?보기 If a grammatical principle that is certainly additional to 서툴�?is a vowel �?and there is no other option apart from a vowel �?then that grammatical principle can't be extra to 서툴�? 상담 간편 전화상담 상품 자세�?보기 Within this lesson, you'll study the t