Regarding Boatman@89's comment on preamble,
“I can neither confirm nor deny ... It'll be interesting to see how many people preferred it that way!”
It's really difficult to say!
A posteriori, having solved the puzzle I prefer it w/o preamble.
But if 21 hours ago while I was struggling, one queried me about a possibly missing preamble, I'd have preferred one!
As a dedicated second guesser / Monday morning quarterback etc. I'll stick with the posterior decision. 🤣