Throw nutshells on the floor:
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Wheeled Supermarket Cart
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Shower curtain opens, closes
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Bicycle rear wheel ratchet
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Soldiers pass by
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Squatting the Mat (1.5 seconds)
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Servo motor
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High-frequency squeak, hum
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Account notification tone, Beep
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Item thrown in the mud
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Purse on the floor, Throw a small bag, wallet
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Pioneer horn, Military
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Scratch
★★★★★