Quote Originally Posted by Marcus View Post
The pronunciation also changes, not only spelling.
Yes, of course. This is simply the first iteration for people who are at the first stage "I need the case endings" And so one can get the answer from the name of the case itself, by substituting the vowels. Pronunciation changes also occur with various examples, going from singular to plural. This approach is just to get the bare bones down rapidly.

And Throbert, I agree completely, different approaches are very useful and it's good to look at them all. This topic of mnemonics is large, and it is useful to look at all the approaches, to see the special useful characteristics of them all.