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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's not a server problem, then you do actually enter an infinite loop somehow. You could add an operations counter and make it stop the function execution when it reaches some very big value (with a message to stdout ofc) to verify this.