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