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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.
1 rotation to the left === (s.length-1) rotations to the right though..
I feel like the precision in the kata description was more of a context clue, to not get devs confused as to what exactly the author was referring to with the word 'rotation'