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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.
Yes, as many other comments already point out.
It's intentional. This is a 4 kyu kata; you should implement the function yourself.
Not working.
Agn, not a kata suggestion. Stop posting these comments at the discourse (let alone without spoiler flag
_)Kata hint != kata suggestion