#.#             
##.#.#   ##       
#. #.##  ..       
. ...#. #.#    .# 
#  ..#....#   ..  
##. ......###...# 
..##...# .....#.  
.#.# ##.##..#..   
.##. #..#.##.#    
....#.##..#2#     
.##. ##.#..#.##.# 
#.# .##........#  
 .####..###..#..# 
####....# ∆..#  .#
 .#.....#  #.#    
.########   ..    
#.          .##   
 ##         .#