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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.
Hey man! Thanks for your observation. You're right, the reference actually employs a greedy approach. I tried a bunch of cases and it always seemed to be giving the optimal solution, so I thank you for disproving that. The final example you give is particularly odd; I'll have to look into that. I'll unpublish the kata for now, since this is a relatively large problem and I can't fix it right now.
:)