[1] On a totally unrelated topic, I just realized that a lot of the brivla which I've been using generally with mass articles (djacu, cakla, canre, etc---mass nouns) are defined with "x1 is a quantity of...", which seems to make it already a mass? Does this mean that lei cakla refers to a mass of masses of cakla, in the same way that le'i selcmi is a set of sets? This would certainly seem to make sense, as I dunno what le calka/etc means otherwise...