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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 should not be marked as an issue as it is your task to solve the problem ;)
You need to use a more efficient algorithm, or your program could be getting stuck in an infinite loop somewhere.