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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.
For me the first part was trivial, the second part required more effort.
Got this kata randomly so I didn't initially realize the linked list methods were defined in other katas, would be helpful to call that out. Also would be good to clarify the code given is pseudocode.