Mammoth & Flint Ridge cave system; it actually *has* a
`Colossal Cave' and a `Bedquilt' as in the game, and the `Y2' that
also turns up is cavers' jargon for a map reference to a secondary
entrance.

:AFJ: n. Written-only abbreviation for "April Fool's Joke".
Elaborate April Fool's hoaxes are a hallowed tradition on USENET
and Internet; see {kremvax} for an example. In fact, April
Fool's Day is the *only* seasonal holiday marked by customary
observances on the hacker networks.

:AI-complete: /A-I k*m-pleet'/ [MIT, Stanford: by analogy with
`NP-complete' (see {NP-})] adj. Used to describe problems or
subproblems in AI, to indicate that the solution presupposes a
solution to the `strong AI problem' (that is, the synthesis of a
human-level intelligence). A problem that is AI-complete is, in
other words, just too hard.

Examples of AI-complete problems are `The Vision Problem'
(building a system that can see as well as a human) and `The
Natural Language Problem' (building a system that can understand
and speak a natural language as well as a human). These may appear
to be modular, but all attempts so far (1991) to solve them have
foundered on the amount of context information and `intelligence'
they seem to require. See also {gedanken}.

:AI koans: /A-I koh'anz/ pl.n. A series of pastiches of Zen
teaching riddles created by Danny Hillis at the MIT AI Lab around
various major figures of the Lab's culture (several are included
under "{A Selection of AI Koans}" in {appendix