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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.
A bit late but if you check the question it's stated that the top cube(the last one) will have the volume of 1^3 so m will always have to be at least 1.