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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.
The test cases are written the wrong way around, so the expected and actual values are flipped.
Also, this seems to lean a bit far on the physics side and not enough on the computer science side, but that's more my opinion