.......M......  
   .............  
   ............   
    #Z.......#    
     #......#     
      #....#      
      #....#     ∆
 ∆    #....#     ∆
∆     #....#    ∆∆
∆∆    #..MM#     ∆
∆ ∆   #....#   ∆ ∆
∆∆∆   #....#   ∆∆∆
 ∆∆   #....#    ∆ 
 ∆∆   #.∩∩.#   ∆∆ 
      ######