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