Hi,
I think the difference is that, there are two courses, One of them is compact and the other one is complete. If you want to learn good Persian I recommend the complete Edition, you'd better think big.
just my two cent.....
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Native speaker of Persian 
Advanced Speaker of English 
Intermediate Speaker of german 
Upper-Elementary learner of arabic 
I am an undergraduate of Russian 
I just know a little bit French ! 
I'd love to learn Chinese... 
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