For "Cub" group - connection could also read as add a certain type of letter as well as defining it as being missing. Good wall, ty.

Thank you! It didn't actually accept 'former currency' for me, so something must have gone wrong there? I even refreshed to make sure I spelled it right. Idk if you can still change it.
But good grid, with nice red herrings! I liked the countries group. Ty for making.