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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.
This terrifies me
Using any kind of operation that modifies the original list will change the requirements for autovalidate.
For example .reverse! will cause your code to be invalid but nums = nums.reverse is valid.