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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.
== matches value so 2 == "2" is true. === matches type and value, so 2 === "2" is false.
You description talks about people, and paper, but the tests check for negative values. How can you have negative people or paper? A better description, including the possability for negatives would make sense.