Actually, in the Find Co-Occurring Set Values thread you referenced the discussion is about finding textual co-occurrence in a QDI-type context. That’s essentially the same data problem @jmm has posited above. I suggest reading the co-occurrence thread a little closer and downloading and trying out some of the examples I and others posted there.
You want this sort of display I believe (this image is not the solution for the notes X tags issue, but the visual is the same). There’s examples in the co-occurrence thread that do that.
