/**
  * @param string $confirmation
  *
  * @return string|false
  */
 public static function validate($confirmation)
 {
     return parent::validateMethod($confirmation, 'yes', 'no');
 }
 /**
  * @param string $confirmation
  *
  * @return string|false
  */
 public static function validate($confirmation)
 {
     return parent::validateMethod($confirmation, 'allow', 'deny');
 }