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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.
Really good course. I finished it recently. Scott Allen is one of the best teachers.
https://www.pluralsight.com/courses/linq-fundamentals-csharp-6
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I've done the samem but put -('a'.charCodeAt() - 1) * length outside the function in the reduce start value.
Feeling pretty stupid, was so chuffed when I worked out the equation that didn't even think to expand and simplify...