Yeah, I was always sure it would run out of steam eventually (as I said in another comment), but I do think that point is well beyond where e.g. Duolingo reache

Yeah, I was always sure it would run out of steam eventually (as I said in another comment), but I do think that point is well beyond where e.g. Duolingo reaches. What I described is basic, but once you're generating sentences from data there is quite a lot you can do with it. I also used clozes; once you're reading newspapers with high retention I doubt there's much use to what I'd build. I can tell you that clozing children's books does not at all fulfill the same role having done both.