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If, like me, you're trying to figure out how this works, I've expanded it here to make it more readable:

Hey, thanks! Would you like me to write a commented version of that code? A lot of black magic is still hidden in every line :)

That would be awesome!

Okay :) We're still removing a few bytes but when it's done I'll make a commented version.

Hey, the new version and its updated code are live! http://xem.github.io/sheet/