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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.
apologies, but why is this voted as best practice? that return line is very code-golfy
while I don't see your current solution, it's probably have to do with how you check if the node you're looking at has been visited already