This is at least 7 – 8 years old.
Try more like 28 or 29 year old. But you’re right. It is a goodie. I remember seeing numerous lists like this back in the early 80s. I usually could figure them all out. So far I’ve got most of these, but I’m still missing 10 of them. But I’ll keep working on it.
However, way back in the 80s, there was one that I never got, and it has haunted me until this day. Perhaps someone in the CR can take me out of my misery:
9 = L. of a C.