Decompressing 33 signal bytes [blog]

In my RSS reader, I stumbled upon this code-golfed (i.e. minimised to death) snippet that's fairly clever, but from the code, utterly opaque. I couldn't immediately see how it worked, and since Copilot autocompletes most of my code for me - whether I want to or not, I figured it was a good bit of practice to decompress and understand. First things first: snooze the little copilot bastard for an hour!