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Since delta encoding is applied after this step, it's probably better to just use 26^5 instead of trying to pack extra things into those bits.

oook did some experiments... just counting the size of the delta streams: 17346B for 26^4 and 16852B for 32^4 (as described above)

interestingly, the sweet spot is a mix at 30^4 at 16797B

I've been using the cleaned up list, so it's possible that changes the behavior a little bit.

But more likely one of us has a bug in their logic.