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@@ -1311,10 +1311,9 @@ Challenge sites:
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- [TopCoder](https://www.topcoder.com/)
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- [InterviewCake](https://www.interviewcake.com/)
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- [Geeks for Geeks](http://www.geeksforgeeks.org/)
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-- [InterviewBit](https://www.interviewbit.com/invite/icjf)
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+- [InterviewBit](https://www.interviewbit.com/)
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- [Project Euler (math-focused)](https://projecteuler.net/index.php?section=problems)
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- [Code Exercises](https://code-exercises.com)
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-- [InterviewBit](https://www.interviewbit.com/)
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Language-learning sites, with challenges:
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- [Codewars](http://www.codewars.com)
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