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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.
Code optimization is quite difficult for this problem. Thanks for your advice.
My solution passes all the 63 tests, but fails the random tests.
This was a very challenging exercise.