. u . #  . ##     #       
......# # ##              
 ..  . # .      ∆         
 .##.#..#      #u.#       
.# ...##.#   ##...        
  .... #.####.u#.#        
#.##.#.# .#.## ..#        
.  #  . ...# #...#        
..  # .(...###.#.#        
###. ###.. #.#..#         
#  ##...##u.uuu##   ∆     
.. #.uu#.....uuu#         
   #.. #.....##.###       
  ...# ##..#####..#####   
 #.#   . . # ##.#.....#   
 .    #.##   #..##....#   
      ##     #.....#.##   
             ###..#u#.#   
             ...#...# 5.  
            #.#.##...# .. 
           .. # .....#  #.
           .  #...##$.    
              #... ∆...   
              #..#  ....  
              .##   #.... 
             ..      #..##