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Unused word gets counted as strengthened

This is more of a question than anything else, even though at first it struck me as a bug. However, it may be fully intended, and as such, I would like to be sure.

I was supposed to use the word "sacerdote" in a translation from priest, but I used a synonym, such as "padre", or "cura", I don't quite remember which, just not "sacerdote". Then, at the end of the lesson, I noticed "sacerdote" was among the words that had been strengthened.

Now, not having used the word, I am left in doubt: is that intended, that so long as I use a synonym, the word gets strengthened? Or is it a bug? Because though I fully understand the word, I did not use it in any of the exercises

4 years ago