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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.
Zero is not positive.
Lol, I spent more than a hour trying to solve it, since I thought that 2x**2 means 2*(x^2). I'd write it explicitly.
guess we should use
(current < end && (*current == '.' || *current == '-'))or do not usecurrent < endcheck at all.