###            
                   #.#            
                  ##.#            
                  #..##           
              ###R###.#           
              #..#...###          
     .         #...##.#.###       
     ..        #.#....##..###     
               #. # ...#.##.      
    .  #       #.... .§.#...#     
    #       #  ##.#. #§##.###     
      . #...# ###.#. #.#....#     
       #..# .. .  .∩#....# .  #   
       .####  # .##........##.##.#
  #.# .#. ..#.. ###.# . .## ....# 
     . #  ##. .#  ##.#..#..# .##  
   .     ##.###.... #.......# ..  
 .# ..    .  # # #.. #...#.    ## 
.     .  ..  #.#...#..##. .#      
     .  . #  ## ## ##.#.. .#      
   # # .      # #   #.#.#. #      
   .    . .    ##    ##  ###      
      .  .  #..                   
    .    . #                      
      . ..                        
   #     ..                       
      .   .                ∆      
        #  .