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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.
Get started now by creating a new collection.
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The important difference is that you leveled up your coding skills whereas this user remains dogsh*t.
Anti-derivative and integral are pretty much the same thing -_-