...    ..   
    #..    .#   
.   #..   ..#   
..###..   ..###.
 ......###......
   ....._...... 
     #.....#    
     #_.O._#    
     #.....#    
   ....._...... 
 ......###......
..###..   ..###.
.   #..   ..#   
    #..    .#   
    ...    ..