.#      .....#   
    .#     .......  
     $$   #.......  
     ∆$# ##.....#   
       .##......#   
..      .#......####
...#  ###.(.........
.....##.............
....................
 .....#<..#.....##  
 ###+ ##..##F...##..
       ##+##........
       #............
       #............
       #..##+#######
       #..          
   ∆   #.           
       #            
               ∆