[Lexical distance ](https://www.openculture.com/2017/08/a-colorful-map-visualizes-the-lexical-distances-between-europes-languages.html) from your known language(s) matter a lot. Also pronunciation (tonality, different sounds like clicks, etc) is hard since if we don’t use it, our brains become “deaf” to them. Also stuff like number of characters, language registers… All can make it very complicated for someone who is not used to that.
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