..               
  #.  #            
  #.. .      #.    
 ##.. .##    .     
  ....#.#   .##    
    ..#.# ##..#.   
...#.#3.# .....    
  #.....##..#    . 
......##...#  ## ..
..#..  ##.#.##.#.. 
 ...  #..## ...#.#.
#..  .#.#.# #.#..∩#
..   #..#.# #. ..# 
#   ... ##.#.....# 
   ###...#....##.# 
    ##....# ##...# 
    #. # ...#.. .# 
    # . ####. .# # 
    # # .#..#   .# 
     .  #...## ### 
 #  .. ##..##....