Last night, I accidentally posted the wrong message here. Instead of posting a new one I'd intended, I put up another copy of one I'd posted a month ago. This is what is technically known in Internet Parlance as a "mistake." Say it with me: "Mistake."
I have deleted the first appearance of the message in question. My thanks to the dozens of you who wrote to tell me and to ask if I was going into reruns here. No, I only reuse old stuff for paying work.