I   a   a   a   a        
      c   a   a   F   I   a      
    a   a   a   a   a   a   a    
  a   I   a   a   a   a   a   K  
a   a   a   a   K   a   a   a   a
  a   b   a   a   a   a   a   a  
    a   I   a   a   a   I   a    
      a   a   a   H   a   a      
        a   a   a   a   a        

                    a                    
               a         O               
          a         a         a          
     a         a         L         a     
a         a         a         a         a
     O         a         M         a     
a         N         a         a         a
     N         a         O         N     
O         a         L         M         a
     O         a         a         O     
a         a         a         a         a
     a         a         a         a     
a         M         a         a         a
     O         a         a         O     
          N         a         a          
               a         a               
                    a