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