[SamBam]

From TFA:

> If you want to watch a series in multiple arrangements—perhaps to figure out which sequence of episodes makes the most sense—you need a superpermutation. This is a sequence of all possible permutations. Imagine a marathon showing where you watch the first episode, followed by the second, and then watch the second episode, followed by the first (1-2-2-1). To avoid watching the second episode twice in a row, a shorter superpermutation would be 1-2-1; you would only have to watch three episodes to still have every possible order covered.

> Mathematicians have also calculated the shortest superpermutations for a series consisting of n = 4 and n = 5 episodes (33 and 153 episodes, respectively). Beyond that, however, they are in the dark. The shortest superpermutations for n > 5 are not known.