...   ...    
    #..   ..#    
.   #..   ..#   .
.o###..   O.###..
 ......###...... 
  ......_......  
     #.....#     
     #_.<._#     
     #.....#     
 ......o_....... 
 ......###...... 
..###..   ..###..
.   #..   ..#   .
    #..   ..#    
    ...   ...    
   ..       ..