Exhaust fan:
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Hard disk, read, spin
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Whatsapp notification sound
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Electric razor
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SMS notification sound
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Faulty air conditioning, vibration noise
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An electric toothbrush
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Electric wheelchair
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Cool sound for notification
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Off, humming fan, Computer turning on
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Spaceship freezer, defrost process
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Popcorn machine
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Sound to start presentation
★★★★★