##### #.<.## ##...## ##...# ∆ # #...## #≈ ##...# #≈≈ #...## #≈≈≈##...# #≈≈≈≈'...+ #≈≈≈##...# #.#≈≈ #...## #.#≈ ##...# #.# #...## #. ##...# #. ##...## +. #.##...#### #...#.l......... ∆ #....#######.. ###### ∆