Minimal Embrace Ring

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