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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.
An empty string will always return false, but in this case we should return true if the string ends up with no characters.
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Really liked your solution. The way to use Math to make sure the number was in the range was very clever.