/**
* @param $city
* @param $postalCode
* @param null $memo
* @param null $abbreviation
* @return ZonePlan
*/
public static function registerZonePlan($city, $postalCode, $memo = null, $abbreviation = null)
{
$zonePlan = new ZonePlan();
$zonePlan->setCity($city);
$zonePlan->setPostalCode($postalCode);
$zonePlan->setMemo($memo);
$zonePlan->setAbbreviation($abbreviation);
return $zonePlan;
}
