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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.
Thanks for your feedback, random tests added.
Yes, you are totally right, thank you for pointing it out.
Changed to "...since the start of the Anno Domini (January 1, 1)".