I think they are sorted alphabetically, and therefore the ‘N)’ prefix in all of them

OpenSCAD, eh?

For straight memorising, I used to rewrite by hand the text. I took a long time, but I was stuck in my head since I had to “think” every word as I wrote it. Then usually I didn’t even had to read it again. But that was in high school, so probably it wouldn’t work that well now