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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 is a great example of a solution that is rather clever, but I don't think would be considered a best practice for readability sake alone. The tilde is going to drive a lot of traffic to MDN ;-)