Thanks all. I am on the road now, with online participation limited to primitive tapping on my phone, so this is - perforce - a sketchy response.
I originally had only V2, but thought some introduction might be necessary. That might have been a mistake. I'll think further about that.
The pun in 121 was intentional, of course, but I didn't see the potential pin in 212 until after posting.
Cheers
David
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