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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.
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14 should equal 13error message, 14 is what your function returned (not the input value) instead of the expected value of 13. Your code is wrong, print the input or check the last sample test.