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David Zadzoraleft a comment
The other day, I felt like learning more flags of the world, but the apps I came across weren't quite to my liking (most of them were just about choosing answers). For me, the most effective way to learn new things is to constantly rewrite them, and the key factor is repetition. And this app does exactly the kind of learning I like best.
Flag LearnClean app to help you master world flags