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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.
No harm done, just use spoiler flag from now on when posting code even in solutions.
Because what you post here is visible if you don't in the home page and it was an spoiler (already marked it for you).
Use spoiler flag next time, please.