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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.
"...has exactly 4 letters..."
This solution accepts "2pac" and "@&%!", which aren't exactly all letters.
Kata description says: "...a list of strings..." 🤷♂️
Doesn't this take into account strings with digits in them as well ?