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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.
The description does not specify that nums will always have one or more numbers.
And it's usually a good practice to check that a value is not zero before dividing something by it.
What is the purpose of the last part? There isn't a case where nums doesn't exist.