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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 like using the tools the language provides, so I think the use of uniq! is best practice for the requirements.
However, why use split("") over chars, which does the same thing and is more expressive?