Chain

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