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An 18-wheeler is crossing a 4 kilometer bridge that can only support 10,000 kilograms and that's exactly how much the rig weighs. Halfway across the bridge a 30 gram sparrow lands on the cab, but the bridge doesn't collapse. Why not?
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This dog, is dog, a dog, good dog, way dog, to dog, keep dog, an dog, idiot dog, busy dog, for dog, 20 dog, seconds dog!
Now read without the word dog.
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