User blog comment:SandstoneGem/Sandstone's second notation/@comment-30754445-20170610181026/@comment-30754445-20170610192107

That much is obvious.

But I still don't understand what [x[x]x] is supposed to mean. What's [3[3]3]?

And what's L? How do you know what 'x' to use for the value of L?