i interpreted my theme as "no C and O as a pair (CO)" and not them individually, but i agree that i overlooked the individual C and O aspect of it. sorry if this puzzle didn't make sense to you!
JR 🤓52s · 2024-06-25T06:11:32.848Z
Ah, this put me on the right track: I think the proper answer to 7A is COINBOX. But the proper answer to 4A ought to then be CONCUR, not COINCUR…