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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.
Interestingly while this solution is very terse the functions computation grows much faster than if it were to use a single loop and push the result to an array.