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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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Added sample tests to JS version.
There's no sample tests, but there are actual tests when you hit "attempt". Sample tests didn't used to be required, and this is a pretty old kata (2014).