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