An electric toothbrush:
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Computer turning on, off, humming fan
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Email message sound
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Faulty air conditioning, vibration noise
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Android notification sound
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Defrost process, Spaceship freezer
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Exhaust fan
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Read, spin, Hard disk
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Off, Old tv on
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Sound to start presentation
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An electric toothbrush
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A vacuum cleaner
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SMS notification sound
★★★★★