First C Program courtesy of Imagination's End <stlauren@cadvision.com>
Additional Web Site courtesy of Michael Neylon <mneylon@engin.umich.edu>
(Originally developed by Andrew Plotkin <zarf@cs.cmu.edu>)
Second C Program courtesy of Peter Bennett <pbennet@oxmol.co.uk>
Third C Program courtesy of Peter Bennet <pbennet@oxmol.co.uk>