Question meriting some thought....

Hey. I've wondered, if you learn one system, can you read snippets of other systems? I've taken up Pre-Anniversary (you could say I took people's word for it as a challenge, per se) and since it's the system with the greatest memory load (hey, I've learned pi to a hundred digits) and thus the greatest amount of signs for words, is it possible to read other systems, filling in the blanks on the way. For those of you confoosded [sic, haha] by big words, this is what I mean: Learn Preanniversary. Come across snippet of shorthand dated 1970. Possible to read?
15-yr-old l33t
(I'm flattered by people's comments about me being 15 years old and learning shorthand by the way...)

(by leetmitationisticalism for everyone)