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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.
One of the conditions of the task is to not mutate nodes, so I think you can't apply your solution
I'm in shock :0
This comment is hidden because it contains spoiler information about the solution
Reworded using Mark's suggestion