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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.
Why didn't you write return n * 2 - address + 1;?
what happen to index 0? it will be alwayes 0
Do you mind me asking how you came up with that? I never would have thought of it.
Thank you so much
great solution!