###       
   .   ##   #.##      
  .#  ##.#. ##3#      
   ... .  # ##5#####  
 ....#.  .### #5#..# ∆
 ...#.. .........#.#  
.#  .  #..... ..#..#  
.   ..#. ..## .≈####  
 .. #.#... #.#.≈.     
   .. ....#..##≈.#    
  ..#..#...# . ≈.#    
..  ... .   . ..##    
...# ..#  #   ....    
  ....  .   ... ..    
.....#....  #. ...    
.. . .#. . .. ..      
.. .  . . # #...      
 ..   ...#.   .       
 .   .  . .