∆ 
                                     ∆ 
                                       
            ##########++##########     
         #+##................##..#     
  ∆∆∆ ∆∆∆+.##......#..#......##..#     
##########.##................''..#     
#...........'................'(..#     
#+#####+#####......#..#......##......o.
   ∆∆       #................##......D.
   ∆∆       ####'#####++###############
   ∆∆       #.......#                  
   ∆∆       #.......#                  
   ∆∆       #.......#                  
            #...<...#                  
            #.......#                  
            #.......#                  
            #.......#                  
            #########                  
                                       
                ∆∆∆∆