∆∆∆∆∆           ∆ ∆     
 ∆∆∆∆∆            ∆      
                         
                         
                         
                         
       ##########++######
       #................#
 ∆∆∆+  #......#..#......#
#####.##................+
......r'................+
##+#####......#..#......#
    ∆∆ #................#
    ∆∆ ####'#####++######
    ∆∆ #.......#         
    ∆∆ #.......#         
    ∆∆ #.......#         
       #...<...#         
       #.......#         
       #.......#         
       #.......#         
       #########         
                         
           ∆∆∆∆          
           ∆∆∆∆          
           ∆∆∆∆          
           ∆∆∆∆          
           ∆∆∆∆