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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.
O-notation is used to indicate how the worst-case running time scales with the input. Basically, in the worst case scenario, a string that is twice as long takes ~4 times as long to process.