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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.
What's that even supposed to mean? In the usual persistent lists inspired by pure functional languages, 'next' can't change. Eg, with xs.append(ys), there would be no sharing of nodes with xs, only ys.