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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Nice Kata, but I think it can be improved by adding an explanation on how to differentiate a polynomial. This will make this kata more accessible for those who are not familiar with Differential calculus.