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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.
Not an issue, expected value in the tests are correct.
Are you sure it's not the one above that is failing in your solution, i.e. [3, 3, 3, 3, 3] IS expected to be 300.
If you look at my reply to a lot of other people, you might have the same problem with your solution to [3, 3, 3, 3, 3].