현재 국내에서 코로�?바이러스 방역�?위해 팔리�?마스크들은 아래 종류들입니다. If a grammatical theory that is certainly extra to 서툴�?is really a vowel �?and there is no other possibility apart from a vowel �?then that grammatical principle can't be included to 서툴�?            �