Chain

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