Apparently this was an exercise book he made for a parisian tutee, who later fled the french revolution, leading to the confiscation of the notebook by the revolutionaries.
I'm suspicious. Didn't Mozart use a word processor?
I mean, not a PC program, that would be ridiculous, but one of those dedicated stand-alone word processor systems (like Smith-Corona made) that they used in ancient times.
It's even worse in product naming and advertising. Nothing can be just "vanilla", you have to even put an adjective in front of your adjectives, like "Mexican vanilla".
EDIT: s/verb/noun/