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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.
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Fun Kata. Curious, what are Harshad numbers used for?
I like the compact solution.
One question for you—why didn't you check for
if len(numbers) >=4versus justif numbers?