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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.
The fact users keep asking the same Q over and over and over and over and over and over again, does imply the description could be improved.
How about reading hundreds of comments below? The tests are correct, it's just unfortunate there's only 1 test with edge case.