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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.
Beware of big numbers, tail-call optimization is not used here! For more information about Elixir tail-call optimization, read the official docs regarding recursion https://elixir-lang.org/getting-started/recursion.html where (at the moment of writing) is a link to the wikipedia "tail-call" page.