Words that I learnt but not practiced

Today I saw this in the vocabulary: Alt text As you see in the picture, there are words (like demain, revoir and tard) that are really weak and I practiced them 3 or 2 weeks ago (I think that some of them were just in the placement test...), but also some pretty strong words that I practiced a few days ago (like veste).

Why did the weak words practiced rarely, while some strong other words were practiced often?

(Sorry if I wrote some english mistakes, I had no time to check the text)

December 1, 2013


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