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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.
noted, should have looked harder beforehand
Seems to be no test to enforce the randomness of the arrays.
Could use further tests so that just making the function return 'string' doesn't solve the kata.