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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.
The column names are confused in the solution. Will this code be validated if we swap the designations of the columns "letters" and "numbers". I think yes. This is worth doing. And the validation code itself should be improved.