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About '():
  The T Project style sheet says
  (a) False and the null list are not assumed to be the same object
  (b) The variable NIL has false as its value; we don't depend on its
      having an external representation
  (c) Don't assume the empty list evaluates to itself
  (a) Notate the empty list as '() in programs
  (b) Notate false as NIL

The T style sheet is highly tuned dogma that we encourage you
to use,  though we plan no inquisition for the infidels.

RAK found a bug in WALK that we have fixed -- "the WALK that
really works" was his patch.