As though quoting Scripture, the entire community seems speaks in one harmonized voice when it comes to F2L:

Yeah, ok. I get the point. Intuitively, it’s not hard to grasp pairing corners and edges and then inserting them. And it’s not hard to see how to do that in many instances — splitting pairs, using empty slots, etc.

But I do contend that certain F2L cases are anything but intuitive. In particular, I found completely non-intuitive the cases in which a corner is inserted (but flipped), with the corresponding edge in the U layer. Indeed, I’ve gotten in the inefficient habit of simply getting the corner into the top layer without regard to where (with a R U R’, for example), and then treating it, ahem, like an intuitive F2L case.

No longer. I’m committed to learning the four cases below. The first one is easy — a Sexy Move plus an easy peasy insertion. But the others are so damn similar that I find it nearly impossible to keep them separated in my head. Any suggestions?

setup	pairing	insertion
	(R U R’ U’)	(R U R’)
	y’ (R’ U R U’)	(R’ U R)
	(R U’ R’ U)	(R U’ R’)
	y’ (R’ U’ R U)	(R’ U’ R)