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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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You might be returning a list of tuples of integers when instead you need to return a list of Nodes, which happen to repr exactly the same way so the assertion failure output is not super helpful.
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