Morsetto sella

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