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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.
If you run your code against that specific test case it moves the 1 over to the right by 1 per iteration instead of by 2. Also the rule on that one is the same length as the initial, Just a hint. If you need more help you can respond to this and i'll try to help more.