For my book, I had to draw a number of graphs. Obviously, I wanted to have a programmatic way to do that, and Graphviz is the goto-library for that. In Lisp, the interface to Graphviz is cl-dot, but, for me, it wasn't easy to figure out from the manual the "simple and easy" way to use it. I.e. I couldn't find a stupid beginner-level interface, so I had to code it myself. Here's the implementation that allows anyone with a REPL to send to Graphviz lists of edges and obtain graph images.
Generated images:
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