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  // Referrer blocking.
  $items['admin/settings/referrer-blocking'] = array(
    'title' => 'Referrer blocking',
    'description' => 'Manage blocked referrers.',
    'page callback' => 'system_referrer_blocking',
    'access arguments' => array('block traffic'),
  );
  $items['admin/settings/referrer-blocking/%'] = array(
    'title' => 'Referrer blocking',
    'description' => 'Manage blocked referrers.',
    'page callback' => 'system_referrer_blocking',
    'access arguments' => array('block traffic'),
    'type' => MENU_CALLBACK,
  );
  $items['admin/settings/referrer-blocking/delete/%blocked_referrer'] = array(
    'title' => 'Delete referrer',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('system_referrer_blocking_delete', 4),
    'access arguments' => array('block traffic'),
    'type' => MENU_CALLBACK,
  );