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July 12, 2017, 10:21 a.m. -  Cam McRae

Think of a metal ruler like you might have had  when you were a kid. Try to bend it in one direction, so the flat surface is bending, and it flexes easily. If you try to bend it so the narrow edge flexes and you won't have much luck. Not a perfect analogy but there is a similar concept at work.

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