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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.
Maybe. But you still need to create whole data of days
So I think it just one of the way to do this
it would not shorten the answer or make it run faster i think