Assertion: domain name's label | /r/MadeOf | letter
Facets:
value: through z
type: OTHER
Source sentences:
text: The Internet standards (Requests for Comments) for protocols specify that labels may contain only the ASCII letters a through z (in a case-insensitive manner), the digits 0 through 9, and the hyphen-minus character ('-').
text: A label is a case-insensitive character sequence anywhere from one to sixty-three characters in length, containing only the letters A through Z, digits 0 through 9, and the - character (which may not be the first or last character in the label).