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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.
https://en.wikipedia.org/wiki/Narcissistic_number
Arrays are always faster regardless of "complexity" since that only applies to mathematical functions limit to infinity and their growths, which is not how hardware behaves...