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Project Euler (http://projecteuler.net/) is great for this kind of thing.

The problems start simple, which is perfect for the "learn the syntax" / "learn the tools" phase.

Then the problems get harder, which is perfect for the "learn the advanced features" / "learn about the community" phase.

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Exactly this! ... I started learning Clojure but I was too green to build something complex, so my problem was "Where do I get problems to solve with it?" and somehow I stumbled with Project Euler, where many others implement solutions in other esoteric languages as well.

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