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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.
Awesome!
Clever, but it can do in one line.
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Here you do all of the work and then throw it out if the input wasn't the right format. Granted this is a toy problem.. but this pattern is not best practice.