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