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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 report! @SadVanity made a mistake in the translation. The Sample Test cases are fixed. You may need to reload the kata to see my change.