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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.
If it takes 1.2s just to run the sample tests, you'll run out of time for the random tests easily. (There are 25 random tests, and your time limit is 12s.)
If you read the descriptions carefully: