I decided to toss it up again because I came across a small 4-col chart I had while cleaning house, and was reminded not only of the simplicity, but my original

I decided to toss it up again because I came across a small 4-col chart I had while cleaning house, and was reminded not only of the simplicity, but my original surprise when I saw it on HN a couple years ago...I figured at least a few more people hadn't seen it yet and could appreciate it.