% This material goes at the beginning of all Stanford GraphBase CWEB files
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\noindent\copyright\ 1992 Stanford University
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This file may be freely copied and distributed, provided that
no changes whatsoever are made. All users are asked to help keep
the Stanford GraphBase files consistent and ``uncorrupted,''
identical everywhere in the world. Changes are permissible only
if the modified file is given a new name, different from the names of
existing files in the Stanford GraphBase, and only if the modified file is
clearly identified as not being part of that GraphBase.
(The {\ninett CWEB} system has a ``change file'' facility by
which users can easily make minor alterations without modifying
the master source files in any way. Everybody is supposed to use
change files instead of changing the files.)
The author has tried his best to produce correct and useful programs,
in order to help promote computer science research,
but no warranty of any kind should be assumed.
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Preliminary work on the Stanford GraphBase project
was supported in part by National Science
Foundation grant CCR-86-10181.}
\def\prerequisite#1{\def\startsection{\noindent
Important: Before reading {\sc\title},
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\def\prerequisites#1#2{\def\startsection{\noindent
Important: Before reading {\sc\title}, please read
or at least skim the programs for {\sc#1} and {\sc#2}.\bigskip
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