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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.
Those are both correct, make sure you're looking at the cubes for the second array.
For that second test case you end up getting back 110 for the first array & 405 for the second.