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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.
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Why do you say at most one operation? What is your definition of an operation? In the sols there are examples with lots of ops!
Why are the lists in the test outputs not reversed ordered?