.#    
                          .  .  
                         .# ..  
                #  ###   .#..   
    .    ..    ##.  ..  ...#    
#  . . ##...   ...   .##...#  # 
   .      .# ##.#.#  #X....##.# 
    #  #. .###..##.  #.####.#.# 
      .... ...#....### X#..#..# 
  .    .   .. #.###.X#........# 
        .# .  .# #....#.# . .## 
 #  .  ... ...  #...#.###.#..#  
     #  ## .# #.#......#..#.##  
     # .##..#..#..........###   
    .  . #. ....#.#.#...##.#    
    . ..  ..#.#∩##...#### ..    
   #.  . # .. ##..####     .# . 
     #..  ..#. ##.### ##   #. ..
   .   .  .#..# .#.#....  ...# #
      . .##.. .#.#..###.  .# #  
 .#        . #####. .#. #       
      #   . #     #####.#       
                      ##