3                   ***          3***
3                ***9....3**     **9...3***
3               **9........3** **9.......3**
3        ***    **9..........3*9.........3**    ***
3     **9.....3**  **9..................3**  **9.....3**
3   **9.........3**  **9..............3**  **9.........3**
3  *9..............3*   *9..........3*   *9..............3*
3   **9..............3*   *9......3*   *9..............3**
3     **9..............3** *9....3* **9..............3**
3       *9......................................3*
3     **9..............3**9........3**9..............3**
3   **9..............3*    *9....3*9....3*9..............3**
3  *9..............3*    *9........3* 9...3*9..............3*
3   **9.........3**    *9............3* 9...3**9.........3**
3     **9.....3**    **9...............3**9....3**9.....3**
3        ***    **9...................3**9.....3***
3             **9...........3*9...........3**9....3*
3              **9.........3* *9.........3** *9......3*9..3*9..3*
3                *9......3**   **9......3*     3*9........3*
3                  **  *       *  **           *9...3*
3                                                *