Valideringskod
      *  *     *   *****         *  *******  
      *  *     *  *     *        *     *     
      *  *     *  *     *        *     *     
      *  *******   *****         *     *     
      *  *     *  *     *        *     *     
*     *  *     *  *     *  *     *     *     
 *****   *     *   *****    *****      *