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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.
probably you are using recursive functions rigth ? it happens because all code languages can handle only a certain amount of functions during the execution and your code have probably surpassed this number.