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Beep, phone number, four
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Police radio dispatch. Middle aged man says, "Ten four."
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Police radio dispatch via interior car perspective. Middle aged woman says, "10 4"
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Morse code with a weak signal, number four
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MF style telephone button beep via speaker number four.
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Antique rotary telephone, dials number four fast, payphone
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MF style telephone button beep number four.
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Medium group of men shout, "Four"
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Computer voice from a Boeing 757 cockpit saying 'serial number one, five, four'
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Brushing four four electronic percussive loop sequence