What’s your area code? Does it have a 1 or a 0 in the middle? That’s a proper area code. Due to a quirk in the brilliantly elegant Bell System switching design, all area codes had 1s or 0s in the center. That way, the system knew whether you were dialing an area code or a local exchange, which used to have beautiful names like WAverly-6 or LIncoln-2, back before you had to dial a bajillion digits to call your neighbor down the street.
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