[nabs-l] grade 3 braille

[sami osborne]

Hi All.

I am creating this topic further to Dave's post about NFB 
training centers, who said that he learned Grade 3 Braille in 
those  centers.
I didn't want to post this in that topic so as not to go 
off-topic.
So I would like to know, could someone try to explain how this 
works? Because to be honest, this is the first time that I'm 
hereing about it.  Was this only discovered recently? Does it 
have, say, more contractions then grade 2 braille uses?
I'm sure that I'll be able to understand your explanations about 
it, because I have been using braille for quite a long time 
(since I was in kindergarten, and now I'm in 11th grade).  I 
don't think I've learned grade 2 braille when I first sttted to 
learn braille, but I have been using grade 2 braille for as long 
as I can remember, and am therefore very good at it, if I say so 
myself.
Not only that, but I just finished the course on Braille music at 
my music school.
I hope you'll be able to explain how Grade 3 Braille works.
Thanks.

Sami.