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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.
Not a fan of modifying p0, but apart from that, this is a very nice solution.
Not keen on how the value of card is changed from it's original meaning of the price of the card.