Generalizing the shuffle to arbitrary numbers of blocks.

Not doing the reading.

Math is hard. Let's go counting!

Rotating in the minimum number of steps by performing cycle decomposition.

We've seen this before.

Moving in a straight line, in a different way.

Modern this and that.

A variation where we try only once.

Just let each person take turns trying.

Caching the result and knowing when the cache is valid.