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