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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.
22 being the thresholds makes me guess that you overflow on computation of factorial.
For some very general hints you can see here, especially third bullet point.