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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.
You don't need the ternary; a.contains(x) will already return either true or false by itself.
Elegant solution. Could you please explain why putting the range inside a tuple is generating an array as a result when .reversed() is applied?