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