Absolutely loved this — the grid fill, all parts of the end game (especially that pdm with the couplet) and the title.
This is one of the trickiest Listeners that I've managed to complete without help so far, and it was a joy throughout. Thanks, Aragon.
And even though I didn't need any help this time, thanks to the regulars here for the non-nonsense, if-you-need-help-you've-got-it attitude which keeps me at these things despite the more dispiriting weeks.