Ah.
So back to a core problem of Pd: many important features, that are basic operations in other languages, are external libraries in pd; external libraries are undocumented in core (which is reasonable); therefore basic operations (list-map is a basic operation...) are inaccessible from core, without forum assistance.
User impact is that I have to budget extra time for just about every class demo because I can't just look it up somewhere -- I have to wait for answers from the forum. Maybe I could search for it in 5 minutes, but a forum question might not be answered until hours later.
There really should be a list somewhere of external libraries' contents.
hjh