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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'm stupid :(
This is "clever" but not best in practices, since there is great chance that the sum of part os its digits may be larger than itself, so "Not !!" can be returned without calculating the last part.
But, it's short and hacking! :)