In the approximately 1300-1400 lessons or so that cpod has put out, how many different words would a student have learned, assuming they listened to all the lessons?

I don't expect that someone actually go through all the pdfs and count words manually.  But i'm thinking that a word macro could count different words in all the lessons, and spit out a value.  I'd be willing to try and write a macro (for free,  of course) and have cpod use it to count words.