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Electric saw short whirr and burst
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Sharpening a pencil in an electric pencil sharpener
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Inserting a dollar bill into a vending machine
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Circular saw cutting wood then drops
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Circular saw starting, spinning, then stopping
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Whrring of a computer fan
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Bicycle wheel spinning freely with sound of gears whirring
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Many bicycles racing with loud gears whirring and wheels spinning
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An air drill working, constant whine
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Sharp whirring click of camera shutter opening and closing