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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.
Thanks! I did a pretty interesting generator approach to this kata.
This is a trivial math exercise if you are wondering. If you are struggling with this equation, draw out the diagram of the connections (or possible connections) until you can generalize the problem.
As far as duck typing is concerned, this one is for the birds.