Handling lists and data with [zl]

The collection of [zl] objects isn't something totally new to me - I used it perhaps twice throughout my undergraduate projects, and recently began to explore it to transfer the data from the Markov user interface into a probability histogram for [prob] to understand. It's becoming clear to me now that I have been missing out on some extremely useful objects! There are so many ideas that I had in the past that I was not able to achieve, because I was unable to think of ways to handle lists in complex ways, or format messages with annoying syntax. The [zl] objects have opened up many doors in this respect.