..          
     ..          
     #.          
  ####.          
   ....          
    #..######    
    #..@a...#    
#####<..#        
........##       
######...#       
     #...# ∆#    
     #.#.##.#    
     #.#..#.#    
     #.#....#    
     #.#...##    
     #.#.#.......
     ..#.#..#.###
    ####.#..# .. 
    #..#.#..#  ##
    #..#.##>#    
    #..#.# #.  ∆ 
    #..#.#  .    
  ###.>#.#       
  #....†.#       
  ####<###       
     ###