.                    
                                     
                  #                  
                 #.  #        #      
       #    ## # ....  #     .       
     .##.##  .#   .  #.   . #.  .    
      . .. .#  .#.....      .        
    #     ... . #. .###### ...       
 .  #.#   ..   #.#..∩.#...##.   ###  
 . .   .. .    ## ..........####..   
 # . ..  #. .#  ##........#.#...#    
  .  #.    #  .# #.......#X.#..##    
#.#    #.. ## # ##........#.X#..#    
    .  . #. .#.............##.###.   
u   ?  #u #...............#3.....#   
  #[# #  .#.#...........#.........#  
  . .#...u#.  .#........#u..##..#...#
    ##.. #u#. ##  ........#.# .#..#..
     #. .#.#. ...# .#.#...#...##... #
    ..##. .# #..  ##.##...#...#  ..  
    # # . .u#.#### ...#..#.....# ... 
 .       ...u. #.u.###.....#...#     
     .   . ......u## .##.####...     
     #  # . . ###.# #. .... # .      
   # ..#  ...#  #.... .#.#.#         
    ...  #.. #  #####      #         
    .   ......                       
       .#....        .               
      # #.#..#       .               
        # ...