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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.
Custom error message is generated after the user's possibly modified the input.
Edit: now that the input arrays consist of ~50 elements on average, your custom error messages are more annoying than helpful (assuming logging the input on error is helpful at all).
The user can modify the input.