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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.
This was a very enjoyable puzzle. One thing that can be added is to test for cases where the user tries inputting negative numbers or 0. It might not be too common in the world but people do crazy things.
Very interesting. I was able to however to pass through numbers and functions alright.