. ##.. .#. . #...##. ## #.. # . ##.# # # ...∩+# . # .## .# #.#...##....#.#... ##.. ..## #............. X..#. .# ..#............. $. .#..###.....v..#..# . . #. #........... # ###..##.XXXw..#... #..#...###X.X.Xw...# #.......X.XXX....# #####..##vX*X...φ# ...#.########### ..###.#.. .# .## #. .# # #. #