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Old words won't strengthen

I have been using Duolingo inconsistently for about four years and decided that now is the time to actually dedicate time to it, strengthen all my skills and learn new skills. I have a a completely gold tree (up to my current skill) but i have 405 words that are not on full strength. It seems like no matter how many times i "Practice Weak Skills" this number doesn't change. Any ideas?

3 years ago

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