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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.
That's kind of a dick thing to say :P I'm just saying that the description isn't particularly clear.
The description is nearly impossible to understand. I don't necessarily think this is a difficult problem, but holy hell is it hard to figure out what you're even supposed to be doing.