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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.
I didn't even think of not needing to actually cube the values. cubing an odd number will still be odd, cubing an even number will still be even, so the sum of the original will have the same even or oddness as the sum of the cubes.
This is my favorite one, completely forgot about zipping