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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.
I really liked the kata, but I have to agree with @SherryXueyingLi, most of the solutions don't check for invalid values in the vectors. Maybe just mention that if a vector is passed, it will always contain valid values?