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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.
I'd add larger numbers for tests to avoid use of recursion.
this one is really early solution.
not it will fail on last test with RangeError: Maximum call stack size exceeded.