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