Thanks go to these kind people for comments,
bug-reports and humor.

      N. Eko Fajar   eko@c.csce.kyushu-u.ac.jp
     Aubrey Jaffer   jaffer@ai.mit.edu
       Jeff Tuckey   jeff.tuckey@berkeleynet.com
      Norm Matloff   matloff@cs.ucdavis.edu
     Graham Seaman   g.seaman@westminster.ac.uk
  Richard Stallman   rms@gnu.org
         Ali Fawaz   ali.fawaz@tsqware.fr