Colorize a ranked digraph with a range of colors.
Colorize one or more ranked digraph (that were already processed by dot)
$ gvcolor [path/to/layout1.gv] [path/to/layout2.gv ...] > [path/to/output.gv]
Lay out a graph and colorize it, then convert to a PNG image
$ dot [path/to/input.gv] | gvcolor | dot -T [png] > [path/to/output.png]
Display help for gvcolor
$ gvcolor -?
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