/usr/share/doc/graphviz/examples/demo/ is in graphviz-doc 2.38.0-12ubuntu2.
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/usr/share/doc/graphviz/examples/demo/doted.tcl.README
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/usr/share/doc/graphviz/examples/demo/entities.html
/usr/share/doc/graphviz/examples/demo/entities.tcl
/usr/share/doc/graphviz/examples/demo/entities.tcl.README
/usr/share/doc/graphviz/examples/demo/gcat.tcl
/usr/share/doc/graphviz/examples/demo/gcat.tcl.README
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/usr/share/doc/graphviz/examples/demo/modgraph.rb
/usr/share/doc/graphviz/examples/demo/modgraph.tcl
/usr/share/doc/graphviz/examples/demo/pathplan.tcl.README
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/usr/share/doc/graphviz/examples/demo/pathplan_data/
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/usr/share/doc/graphviz/examples/demo/spline.tcl.README
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