The thing that makes me remember it is the word "wherefore", which is a very old English word that actually means "why". I remember that because suddenly the phrase "Wherefore art thou Romeo" from Romeo and Juliet made no sense to me when I learned that. "Hvor" means where, so "hvorfor" obviously has the same root as "wherefore". That may be only marginally useful to some people, but it helped me.
Confused about the pronunciation of laver. When you listen to the initial recording, it sounds like the first syllable is like the English word "lay", or similar to the first syllable of "laeser"(reads). But on the slowed-down version, he says it as "lau-wer", rhyming with English "tower". So is it [lewer] or [lawer] or can it be either?