Robot heartbeat:
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The noise of the elevator, knocking
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Harvesting machine
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Board falls
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US police car siren sounds
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Scanning goods at the supermarket checkout
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Sounds R2D2
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Closing doors, opening, Passenger elevator
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Bagging in the bag
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Battery Hits
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Sine wave (975Hz)
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The noise of the room, electrical appliance
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Unscrewing and twisting the lid of the
★★★★★