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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.
You are right, indeed. Having gained some experience since the time I posted the solution, I would change the variable "new" to something like "translated", and the function name "dictionary" to "translate_leet". Thanks for the tipps!