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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.
Cool!
Could be a problem a for a very big dataset since a loop inside a loop runs in square time.
Trying to make it come down to linear time is a good exercise!