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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.
Negative indices mean that the count is from the end, not from the beginning. So, for example,
[-2:]means - from the second from the end (penultimate) to the end.