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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.
Should have tests for null or inputs other than strings.
Instructions unclear. State that global variable (lost numbers) are to be evaluated by function, or add lost numbers array as argument to function.