----------------------                       
            00                                  
          00                                        
        00                             
---------                        
0         o        00------                       O     
0  S     /|\     00       0                       
0        / \   00         0            ---------------    
----------------          0             H  0              
                          0             H  0              
                          0             H  0              
                          0             H  0              
                          0~~~~~~0---------0              
                          00000000