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