Old tv on, off:
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SMS notification sound
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An electric toothbrush
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Portable fan
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Air conditioning (outdoor unit)
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Hissing old tv
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Faulty air conditioning, vibration noise
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Spaceship freezer, defrost process
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Popcorn machine
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Electronic melody for SMS alerts
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Windows notification sound
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On, Air conditioning, off
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Whatsapp notification sound
★★★★★