What program did you use to draw it?
Vim, with the help of The Unicode Sliderule, and copy/pasting. I used the same thing, plus regexes, to change the thick lines to thin lines.
I first modelled it on paper, then in Inkscape. It started out as a rather complex diagram, but the end result is, as you can see, quite simple and comprehensible.
Update: your post inspired me to look for tools that can help, and I found this nifty Vim script: http://www.vim.org/scripts/script.php?script_id=173
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