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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.
You shoul tell us the concept, because many of us are lost in this kata!
The Node class should be in the description, honestly it is hard to think of a solution without being able to access to Node value or something