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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.
For people who are having issues with a single test case failing, be sure to read the note provided in the kata, which is provided as a hint for this particular issue (or other similar issues you may run into).