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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.
What if you pass your code a negative number?
Try editing the "Example Test Case" to pass a negative number and see what happens. Does it still pass when you press the "Test" button?
It might help if you show the output if the test that is failing.