Mistake 1: spelling changes. Make sure you spell names, locations, magic spells, etc, the same all the way through. Also, be consistent with capitilization.
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The laws of literary creation are unique; they don't change, and they are the same for everyone everywhere. I mean that you can tell a story that covers three hours of human life or three centuries - it comes to the same thing. Each writer who creates something authentic in a natural way instinctively also creates the technique that suits him.