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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.
This poor 8 kyu soul got five downvotes for asking an honest question. It's not like they were snide, cruel, or rude; but trying to learn. I just don't get that.
just
O(n), like it should be. The complexity has nothing to do with that solution being actually... "not very good" (cough).