∆ ∆ #. ## #.. ##..... ..### #.# #.....# ...####.# #...... #.#....# #..... #####......###..... . ##.....#........# ##... ##...............#...... #...............<..# #...................# #...>................... #...................##.. #...................# . #...................# ##..................# ##.....#...........# ##..#. ##.....