An important early RFC from the IETF that specified the format of e-mail messages exchanged between computers on the Internet. Many additions have been made to it, but it remained a standard for many years until obsoleted by RFC 2822 (the number is not a coincidence: it was reserved for this use).
... plural, dual). It has eight cases: nominative, vocative, accusative, instrumental[?], dative, ablative, genitive, and locative. It has over ten nou ...