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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.
Thanks for the lesson, I guess?
Please don't post solutions or code in the discourse. That's what the solutions page is for.
And instead of writing "SPOILER", just ... mark your post as spoiler. There's a button for that.