Morsetto sella

      *    *******  *******  *******   *****   *******  
     **    *             *   *        *     *  *        
    * *    *            *    *        *     *  ******   
   *  *    ****        *     ****      *****         *  
  *******  *          *      *        *     *        *  
      *    *         *       *        *     *  *     *  
      *    *******  *        *         *****    *****