Hi Palio. I love a grid that's loaded with a particular subject material. The only trouble with doing them is that it becomes difficult to keep a unique solution. Some time ago I attempted what you've done here with the same 2 groups and I couldn't do it.
I THINK you can swap North Carolina with Texas or Alabama here and the grid still works - so that would mean non-unique I'm afraid.

Ahh, god dammit, you are totally right. Just looked it up an my memory had failed me on the front. I wish there was a way to edit a grid so I could swap North Carolina with Iowa, but alas.

that's a shame cos its a great grid. Wish we could edit these

That swap would work in giving a unique grid - shame to lose N. Carolina though because that’s your red herring for the States group which adds to the grid’s quality.

I agree on that point, I think I might just re-make this one in a couple of days. I have thought of a couple of ways I can create a unique grid while preserving the red herrings