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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.
Description says:
1000 ≤ year ≤ 9000
This wouldn't take into account years that don't have 4 digits.
Not very efficient
now i get it, damn
This is the best one I've seen so far.
This is virtually identical to the code I came up with!