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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.
cool
but next time, when providing code snippets, use the spoiler flag, so the kata is not spoiled of other users
i've marked both your comments with the spoiler flag
your solution isn't wrong per se, the return type of big numbers is in scientific notation
this can help you