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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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I am a beginner and I am wondering if it is worth it to add a whole library to the project only to use the simple accumulate function which can be done with one line of ranged for loop.