I actually had an engineering ask from somebody to produce "random sequences" which turned out to be anything but random. Short version: letter sequences, no re

I actually had an engineering ask from somebody to produce "random sequences" which turned out to be anything but random. Short version: letter sequences, no repeats in a sequence or in adjacent sequences. Took months and a lot of patience to extract that crucial piece of information from the customer. I actually coded a recursive algorithm which to my surprise generated every possible (three letter) sequence in an acceptable sequence, enough for them for several lifetimes. > Extreme cases tend to be the most or least important. Yeah, that's my suspicion.