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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.
I think there is a bug in tests. For array like [1,2,3,4,5,6] the "correct answer from tests" is 9, which in reality it's 3. Can anyone check this ? It is very simple task, I don't think I didn't see something