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Exercism
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<p>Exercism is an online, <a href="/facts/Open-source_model/uDWVYJ4V">open-source</a>, <a href="/facts/Gratis_versus_libre/YDd7Hjzm">free</a> coding platform that offers code practice and mentorship on 74 different <a href="/facts/Programming_language/cWTYbgWa">programming languages</a>. </p>