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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.
I've updated description to make it more clear.
There are a lot of solutions right now, believe it is clear enough to understand what to do and how to do it :)