...   ####   ..
.... ##..## ...
....##....##...
...............
...............
#..............
   #....M...#  
    #......#   
    ##....##   
     #....#    
     #....#    
     #....#    
     #....#    
     #....#    
     #....#    
     #....#    
     #.∩∩.#    
     ######