A family of grammars for Voynichese

[oshfdk]

Optimal yes, for a practical binary compression that is not the best choice for a metric: it doesn't matter how many actual bits you need to write. Fractional bits aren't writable but they are a better measure of the theoretical amount of information.

I like that it's possible to actually compress and decompress the data with the practical binary compression as shown in the paper, I generally prefer demonstrable results to formulas