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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.
very clever!!! :D
I already solve the problem.
Is there a way to fix the error in the test case in array mutation? My code works well but got an error with mutation upon submitting.