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+Grap is a language for typesetting graphs specified and first
+implemented by Brian Kernighan and Jon Bentley at Bell Labs. It is
+an expressive language for describing graphs and incorporating them
+in typeset documents. It is implemented as a preprocessor to
+Kernigan's pic language for describing images, so any system that
+can use pic can use grap. For sure, TeX and groff can use it.
+
+To be useful, the pic program from the groff package that is included
+in Slackware Linux is required.
+