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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.
Might want to add a test case for f(1000000000000000000000) since this will return false if the solution uses paresInt approach
Getting undefined when running the tests, even after pasting in several solutions which are supposed to work. Every test turns out undefined, not sure if something's wrong.