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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.
Test cases in Ruby don't provide any information
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Awesome explanation! How much time did you spend solving this? Did you come up with moves immediately, or found it after printing many results?