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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.
Personally I did it because it's the most effective way (that I know of) and that is what programming should aim for.
And not be restricted by artificial rules.