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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.
There are still at least 2 cheese in the solutions ;-)
Just randomizing the input is not enough, you need to test more functions and randomize the functions themselves too.