Energy surge, surge:
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Sine wave (975Hz)
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Ventilation inside, The noise of the room
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The noise of the room, electrical appliance
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Laboratory experiment
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Beep time
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Opening, closing a cigarette case
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Energy shot
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Squatting the Mat (2 seconds)
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Throw a backpack on the floor
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The subject falls on the wooden floor.
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Dragging an item on a concrete floor
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Bicycle rear wheel ratchet
★★★★★
