...#. . .#.##...##..#
.#.#  .#.....#....#.#
 ## ..#.#.#.... ....#
    #.##. ...#.. ...#
     ....#...... .#.#
     .#.#...#A#.#....
     ...... ..#..#...
      #.#.##..##..#. 
     #. #.........#  
        ##.#.#...... 
        ##....## #.# 
      ###....#∩#.# . 
      #..##..#. #.   
     ∆#∩.#...# ## #  
      #####....      
     ∆ ∆   ...#.     
           .... .    
           #..##