40
O                                    X  
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                     
  X                                  X  
  X                                  X  
  X                                  X  
  XC                                 X  
  XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX  
X