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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 been agonizing over composing a formula for a long time. I had to look at the solutions. The formula turned out to be quite simple :)