大家好. I've noticed that there are several different vocab decks for the pleco app which I am using. I downloaded the one for all 20 Levels, but they have some discrepancies to the deck per Level. I.E. I'm on Level 4 right now. On my 20 level deck there's some 30 something vocabs, on the deck downloadable from the level itself there's only 14... Which one am I supposed to use for studying? I liked that in the 20 level deck there's a lot of example sentences to practice phrases as well. This seems to be missing mostly from the new 1 Level deck. I'd be really greatful if someone can explain this to me. 谢谢