> BTW, I'd be happy if we could get rid of the "alternate" sets and use "set n" instead > ...
Well, as we see from this thread, some people are mistaking "set n" for version/revision numbers... this is probably one of those things that will be hard to get the point across no matter what phrasing is picked... if it wouldn't make waves, I'd nominate "alternate set n" as being a little clearer.