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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.
A problem with your code isn't a kata issue. It works fine in Python with more than 28k completions. You must be doing something wrong. Post your code using markdown formatting so we can see it.