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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 kata seems to be seriously unintuitive in general.
This one is broken for ruby. The test cases don't pass a Node-like object in the tested method.