Police whistle:
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Sine wave (975Hz)
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Opening, closing the umbrella
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Laboratory experiment
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Plastic bag
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Unlock the bike lock
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Item thrown in the mud
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Scanning goods at the supermarket checkout
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Soldiers pass by
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Spray Shaving Foam
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Unscrewing and twisting the lid of the
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Cereal packaging open
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Passenger elevator, opening, closing doors
★★★★★