Electric wheelchair:
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Clothes dryer
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Computer turning on, off, humming fan
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IPhone notification sound
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Portable fan
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Spin, Hard disk, read
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Windows notification sound
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Off, Air conditioning, on
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Email message sound
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An electric toothbrush
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Popcorn machine
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Spaceship freezer, defrost process
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Faulty air conditioning, vibration noise
★★★★★