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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 think there is a bias toward the Python language in this Kata, in python -2 would 'wrap' to the second element from the end of the array
If start == stop then I imagine the original array should be returned ?