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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 think this is one of the easiest to read. I don't like those one-liners, would be do hard to see what's happening if you ran into that and had to debug it.