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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.
You're correct, there's a problem with the spec. I hadn't caught this either, but "exceeds 10" definitely means "> 10"
That date works perfectly. Keep in mind that when the sum is 10 or greater (i.e. two digits) that we are then to add the digits together (e.g. 10 becomes 1, 11 becomes 2, 12 becomes 3)