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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.
Unfortunely this is not a good solution, it's easy to implement, that's true but it's very slow. I tested it on a list of length 80 and k=6 and it took 188.6s whereas my solution took 1.77s