#.          
    #.        .#
    #.########.#
    #...........
    #........#.#
b.###........#.#
..............# 
    #........#  
    #........#  
    #...F....#  
    #.###.####  
    #.  #.#     
    #.  #<#     
    .   #.#     
    #   ..#     
        ###