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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.
The point in the description is not to show all the steps in a recursion, but to show how the rules can be used to determine the values of the function. You can use recursion, but that's up to you. It's also your job to figure out why and how one could use recursion.
can't do anything with this issue since it doesn't provide a way to reproduce the problem
(also I'm struggling to understand what the problem is here)
your class should raise an exception when the input isn't a valid kata rank. doesn't matter whether or not your user rank is already 8.