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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.
Perhaps some smarter random cases would be nice :)
You can always use a reference solution to check against user solution while you throw any number and kinds of arbitrary random cases to the user.