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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 was so close to this solution. I kept mangling my code trying to build a list comprehension using two for statements. Thanks for posting this solution.
This is a great solution. I was so close to solving it this way myself. My problem is that I failed to include the condition where the index is 0 in my conditional.