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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 guess you don't need to calculate the cube of each digit since an odd number will always have an odd cube and an even number will always have an even cube. The modulo 2 of the sum will always be the same.