en() / formal english (in lps.js?)

[step21]

Hey, so at the SWISH version of lps, it seems kind of possible to also use some kind of formal english as strings, and parse that. Is that possible with lps.js as well? I tried to find more explanations about it, but so far it is not very well documented and also in the code I could not find it. In the length of interpreter.P, it seems like it could parse text, but I'm not sure and definitely do not find en() defined. Do you maybe have any insights into that? ( I aim to compare multiple similar implementations and languages from a contract point of view)