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Re:Ask HN: What Skills to Acquire in 2020? by misiti3780 on Tuesday February 04, 2020 @09:53AM (#22236138)
Re:Ask HN: What Skills to Acquire in 2020? by mechhacker on Tuesday February 04, 2020 @09:58AM (#22236192)
Yep that's it

The boxed set has 3 booklets (Essential/Intermediate/Advanced) that cover all the grammar. Libraries usually have it.

I recommend them for the main romance languages and possibly German but for Slavic or Asian languages I would recommend other sources (I am barely intermediate in Russian and Czech and was trying Mandarin for a while).