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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.
Learned a lot and had fun from solving the kata!
The sorting is quite hard to figure it out without peaking the test, it may be clearer if your description includes an more complex example covering how the sorting should be like.