Stuck....been a week
Okay, I've been staring at this one for about a week. I keep looking for another pure-logic X I can put in somewhere. I've used every technique I know, including the ones talked about in the Advanced Tips YouTube.
I've not been able to substitute or project my way out of this mess. The Trial and Error siren is screaming, and I'm ignoring and ignoring it.
Can anyone find more pure logic X's?