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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.
Instructions do not specify any forbidden characters, but using any letter or number triggers a test failure for this. If this is intentional perhaps it should be added to the instructions?