.    
            ..          . ..# 
            . .        ...# . 
              ..###   # .... #
             .. ... #  .... .#
            ...... ##.#.. ..  
              ... ..#...# .   
         ..#.............. .# 
.        #.. #....# .... ... .
 .##    .# ...#... #....#...# 
  ..#    .. ......# #.....#.[ 
   #.#    #..........#......  
   ##.#####...... #..#. ......
   #....#.....( #......##.#.. 
    #...3.[........#  ........
..........##..#.#.###.##.. .##
....#.....####.###..#.#  .. . 
...#..#..## #.##  ## ##   .. #
.  #.#....  ###               
   #####.#.                   
       ....    ∆              
       ..# .