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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.
Jesse, I had the same problem, until I realized that I was making a palindrome with the numbers 005. If you are adding numbers the to beginning and end of an array or string to get your palindrome, then you need to deal with cases where you have two zeros.