∆ ## .. #. .. ### .# .. #.###.##.. #x#.....# .. #....#.# ...# #xx#.#.# ...## ##.. .# x.#.. #.#..#.## ...x #......###..# # #.......#..x#. #.x ........##...#.. .#.#.##.... ..#... ##.# ###x#....# . #.. #...##### . ## ..#.## .. # ... ...# #........ .. #. .#.. #..#.# ..#.#.#####.. ......# . # ..# ...#.....#.#### ... #..##. ...# #