.. #.. #.. #.. ..#...........#.. .......#...∆. .. ..) .......#......#....# .. #..#....... ...# .. ..##..#......#.#.. . .. .........##.... # ... ........#.....# .## #.. #..#...# #. ##....# ##..##..#.X## .#...# ..........#.#...### # ...........####..# #.. #..##.X#..#...###.#. .. #..##..#.#....#. .# #..# ............#...# . . ..........##........# . ##..##..#.....##... .. #.. #..#.....# .# ... ... ................. .. ............. ..... ..##..##..##..##..## .. #.. #..# .. ..#