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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.
I wouldn't like to spoil the solution, but yes, the task involves correctly unsubscribing from the stream to which the operator was applied.
Personaly, I found it interesting and educational. Thanks for your opinion!