"Oooooh... So you're saying that List1 List2 List3 are actually headers ..."

At first, I did read the rows as being the lists and struggled to work out how the transformation was supposed to be accomplished.

I don't recall the exact thought process: I think three "ListN" in both input and input matching three columns in both (but not four rows in the output) probably led to the guess I made.

"When I first saw your post, I thought you'd lost your mind, but I've switched to ++."

Thanks for generating a hearty chuckle at my end: a good start to my day. :-)