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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.
forked and approved
Random tests should generate a random number of type long since the method ExpandedForm takes a parameter of type long:
Another edge case test should be added for num = long.MaxValue:
If the authour of the kata is active, they get a notification. Otherwise no one will know unless someone randomly comes by, so you may want to mention it in a comment to the kata. (Or maybe I don't know something...)