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