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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.
"Same goes for all the other arrays/lists that you will get in the tests.."
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Sure, and if my palindrome checking function ever becomes a time-critical component of the next NASA mission then I might want to consider re-writing it for better performance.
But until then I prefer to code with emphasis on readability.