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