I learn several languages with those automated emails

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https://github.com/ThReinecke/email_vocabulary

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A few weeks ago, I shared a side project on HN about how I improve my Dutch vocabulary: https://news.ycombinator.com/item?id=42521773

Based on the great feedback I received, I expanded the tool to allow users to learn any language at any difficulty level. Personally, I am now using it to learn Dutch words at C1 and Spanish words at B1 level.