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