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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.
In terms of time complexity, using count() is not very efficient because for each character in the string, you are iterating through the entire string again to count its occurrences.
Good job! :)