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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.
Handling of negative numbers is not specified and they are not excluded by the used types (long instead of ulong in C#). Doesn't really matter, since these numbers are not included in the tests, but I'd like to have my inputs defined, please.