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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.
you get a domain error if you try to square root a negative number, so this needs to be caught first
It is "+1" at the end because the slice operator (:) does not include the last position. So if you print(s[0:1]) it would only print the character at position 0.