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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.
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I agree with your statement here, especially when it comes to error handling (although it's not specified in this kata).
The one line solution seems alot more clean and cool but it's definitely not best practice. Thanks for breaking each section down to the nitty gritty.