.......M......  
  .....Z......Z   
   ...........    
    #........     
     #....M.      
      #....#      
∆     #....#      
∆∆    #....#     ∆
∆     #....#    ∆∆
∆     #....#    ∆∆
∆∆∆   #....#   ∆ ∆
∆∆∆   #...Z#    ∆∆
 ∆∆   #..MZ#    ∆ 
 ∆    #.ZM.#    ∆ 
      ######