40
O                                    X  
  XXXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXX  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  X                                  X  
  XXXXXXXXXXXXX XXXXXXXXXXXXXXXXXXXXXX  
X                                     C