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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.
Your solution is a bit buggy. Try to debug it locally with exactly the same inputs used by CW tests, and you will be able to find the problem.
Not a kata issue.
"Hidden tests" are not hidden: https://github.com/codewars/codewars.com/wiki/Troubleshooting-your-solution#how-can-i-see-which-input-causes-my-solution-to-fail
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