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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.
This is a great and clever solution. But is this performant for longer solutions compared to HashSets ? I am new to codewars. The tradeoffs between efficiency and one liner functions are interesting.