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@@ -1400,6 +1400,7 @@ Challenge sites:
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- [TopCoder](https://www.topcoder.com/)
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- [Project Euler (math-focused)](https://projecteuler.net/index.php?section=problems)
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- [Codewars](http://www.codewars.com)
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+- [HackerEarth](https://www.hackerearth.com/)
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- [HackerRank](https://www.hackerrank.com/)
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- [Codility](https://codility.com/programmers/)
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- [InterviewCake](https://www.interviewcake.com/)
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John Washam