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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 don't know what the last test is about, but your solution is naive, so for really big numbers it will not work. You need to find a better way of computations instead of n1 ** n2.