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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.
This should not be the solution. Out of sheer luck, this worked.
This comment is hidden because it contains spoiler information about the solution
I think this solution doesn't insert a node in the first position (0).