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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 argument exception is one, which signals an exception with one of the method arguments. It usually recevies the argument name ('nameof(...)') in addition to the message.
A little more formatting would make your solution a lot more readable :)