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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.
Would anyone care to explain this implementation a little bit?
I am not quite sure if I follow along the last three if statements.
Why would x2 bet set to 2 * h[++i]?