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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.
Used your examples, thanks :)
It does clearly state that the year will be 4 digits, so 10000+ is out of the question.
There should be some random tests with years in the 3000-9999 range, though.
Pretty interesting idea. Will see what I can do