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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.
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Great, that you found the problem and solved it! :-)
Merry christmas! ;-)
Could it be, that you are changing the input array?
I have exactly the same problem. Did you find a solution?
Update: This Kata is correct. I started changing the original input arr. When I created a new arr to incorporate the shifts my answers were correct.
Thank you for this Kata