The theme of the gamma series of 21.4 releases is "oxymoron", that is,
contradiction in terms.  Each patchlevel will be assigned a unique
codename from the list below.  The rationale for the first should be
obvious.

The second and third are my tributes to Richard Stallman and the early
developers of Lucid Emacs/XEmacs (primarily Jamie Zawinski, but it
also fits Ben Wing which is appropriate to the Mule theme), in
chronological order.  I cannot list all the debts this release owes
for individual contributions, but I must credit the fundamental
excellence of the design of [X]Emacs for inspiring the audacious
proposal to add both GTK and Windows/MULE to XEmacs over a period of
two months, and for the success of the GTK merge.  Without the
prospect of such a big win, I could not have justified trying to
coordinate a release myself.

The rest of the codenames are in alphabetical order.

N.B. I expect that the Stable Release Maintainer will choose a new
theme for the releases following the promotion of 21.4 from "gamma" to
"stable".  So 15 should be enough....

21.4.0: Solid Vapor
21.4.1: Copyleft
21.4.2: Developer-Friendly Unix APIs
21.4.3: Academic Rigor
21.4.3: Artificial Intelligence
21.4.3: Civil Service
21.4.3: Common Lisp
21.4.3: Economic Science
21.4.3: Honest Politician
21.4.3: Informed Management
21.4.3: Military Intelligence
21.4.3: Portable Code
21.4.3: Rational FORTRAN
21.4.3: Reasonable Discussion
21.4.3: Standard C

N.B.  Suggestions welcome until shortly before the release.  (The
non-incrementing version number is precisely to make it easy to add
new oxymorons.)