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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.
The string check should be separated to provide clearer assertion messages.
Probably should increase the number of random tests, my semi-bruteforce solution managed to pass with enough attempts.