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