[ummaycoc]

In my original version I didn't use a nested array of strings, but [Olzd](https://news.ycombinator.com/user?id=olzd) pointed out a way you could do that and I added it as a theoretical first attempt (theoretical since it wasn't my first attempt, but would have been had I been better at APL).

My first attempt did some stuff with subtracting items in an array from their neighbor. Now with info I got from [mlochbaum](https://news.ycombinator.com/user?id=mlochbaum) I have another version that uses windowed reductions.

So those are three versions there; after that I just split it up just to see where that leads and that actually ends up feeling a lot like the Haskell / Futhark solution to me.