Name:Ramses Garcia
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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.
What language, what error? Impossible to help you with so little information.
There is no error, your code mutates the original list. Read about it.
Some solutions present in Solutions section aren't invalidated (don't know why) but were valid when input mutation wasn't tested.