What does "6-MO" mean on textbooks?

Diamond S

New member
So I'm gonna be a college freshman soon, and I'm trying to purchase my Chinese class text-book. Whenever I search the ISBN (9780205008131) on websites, this title pops up: Chinese Link: Beginning Chinese, Simplified Character Version Level 1/Part 1, Books a la Carte Plus MyChineseLab 6-MO

Which is normal, I guess, but what the h*** does "6-MO" mean???
 
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