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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.
Wow... It's... It's... I have no words! It's a surprize! :)
best code I ever seen
Just in case anyone (else) is feeling dumb for not being able to arrive at this simple arithmetic solution...
...I have a degree in mathematics and only managed an iterative solution.